TBI to Carb Swap Chevy Truck Frequently asked Questions

A walk through of frequently asked questions concerning the swap.
Carb-Holley 600cfm #0-80457SA
Intake-Wieand Street Warrior #8126
Fuel Reg-Holley #12-842
Kickdown lever (Turbo 350-400-700r)- Holley #20-121
Accelerator and kickdown bracket-Holley #20-95
TPS Kit for auto trans-Holley #534-202
Throttle stud-Holley #2038
Distributor-Factory GM HEI - Accel Cap and rotor kit #8122
Plug wires-Carquest #358126 - Thermostat gasket felpro #35062
Carb gasket- Mr Gasket #54 - Carb studs- Mr Gasket #6345G
Intake bolts-Mr G#6080MRG - Header bolts-Mr G #917
Wire Seperators-Mr G#9728 (2) - Throttle springs-Dorman #59207
Fuel pressure gauge-Mr G # 1561 - Air cleaner stud kit-Mr G #6399
fittings for regulator- 3/8 NPT to 3/8 barb 90 Spectre #5946 (2)
3/8 NPT to 3/8 straight Spectre #5945
Heater hose fitting- 1/2 NPT to 3/4 barb straight- Irrigation store
Brake booster fitting- 3/8 NPT to 1/2 barb 90- Irrigation store
Heater hose- Carquest 3/4 - 50' #CQ1727 - Intake set-Felpro #1204
3/8 fuel line - 3 feet
5/16 fuel line - 3 feet
3/8 hose clamps (4)pack #AC5F16V
5/16 hose clamps (4)pack #AC52F13V
1/4 hose clamps (4)pack #AC52F13V
Permatex RTV black-#22072 and an Oil and filter change.........

[@Blade-hp9mn]

Jump the oil pressure switch/plug and turn on fuel pump. Had to install the OEM oil pressure switch fired up no problems. Thanks for all your help and knowledge.

[@crewyou07]

Hey Kevin glad you found the problem. Thank you for sharing your solution !

[@davidhill5181]

How do you jump the oil pressure switch? I’m having trouble with this

[@Blade-hp9mn]

Sorry for the late response, unplug the oil pressure switch and get a piece of wire and pump the terminal on the pig tail.

[@davidhill5181]

Thanks for replying just don’t understand Where you ran the jumpwire off the oil pressure switch?

[@davidhill5181]

Are you saying to jump the 2 wires on the ops and plug back up?

[@mikevalentine7226]

Good job man , your a benefit to us all. Thank you for you research and conversion methods.

[@crewyou07]

Thank you for the kind words Mike!

[@Blade-hp9mn]

As always thanks for the quick response, keep up the great videos. 👍

[@crewyou07]

Your welcome Kevin.

[@Redeemed427]

Thank-you, I'm considering dropping a SBC 400 inside my 91. Just seeing what issue's I'd have to combat. Great video.

[@crewyou07]

Your welcome, glad you found it informative.

[@mesochiefy72]

Man, thank you very much for your video. Clear fluent English, extremely informative for my problems.

[@crewyou07]

Your welcome Jay Nice to hear I use the language well, thank you ! Any other questions ? hit me up..

[@patrickpegan5747]

@@crewyou07 thankyou for your time. I got ahold of a 350 tbi distributor plug it right back into the harness and coil. I have a manual so that doesn't matter but the distributor? Using the electronic distributor, was that wrong, I was trying to think it would plug right back into the harness. I don't have a timeing light so I did it by ear and iv only test drove it once besides a countless start ups and a couple burn out, at WOT it seems to be right but like I'm asking I'm wondering if I did wrong? Haven't heard of this done and all videos and forms people have put a vacuum advance hei distributor in. I just don't know shit about wiring and was scared of fucking up so I got the tbi distributor? Thankyou for your time

[@BrantleyBlended]

I appreciate this video. I bought a 1988 Chevy R30 dump truck that the previous owner did a tbi to carb swap on. It does not run very well. It sat for 2 years after the swap was done. I think that is part of the problem. I think they also did a poor job of doing the carb swap. This video should help me get it running better.

[@crewyou07]

Hello Brantley glad to hear my video will help you. I do have four other's concerning the swap you may find them informative also. Feel free to hit me up if you need best of luck with your diagnosis.

[@natethompson9379]

Absolutely awesome! I'm about to do a full delete. TBI and ABS on my 1 98 Sierra. This has been a great inspiration and lots of help. 😊😊😊😊😊😊

[@crewyou07]

Glad you found it was a great help. Be sure to checkout my 5 part series on the TBI to Carb conversion. I explain each step I took to do the conversion.I also posted a list of all the components I used including the part numbers for the conversion. It is listed in the description section of the video.

[@DrShankenstein]

Thank you SO much for posting this!

[@crewyou07]

Your very welcome !

[@Whelessry]

I didnt realize your truck was 90's style the first time i watched your carb swap, mine is a 94, ive got an update video on the fuel system, my set up is very similiar to yours as far as the holley carb and tps goes, i know that a transmission computer was put in and wired up and the engine in mine is a 1984 454. So as far as the engine goes, i pretty much bypassed all the electronic stuff

[@Redeemed427]

What transmission did you choose?

[@thorncreekdave1701]

Just finished this conversion on my 1990 K2500 w-700R4 tranmission. I have only driven it about 15 miles so far and it is running great. Used all the major parts that you used. I used the Holley TV cable bracket for the transmission and it seems to be shifting fine but I don't believe the torgue converter will lockup until I install a torque converter lockup kit like the TCI 376600. Has anyone else needed to install this kit. Thanks for the great videos and the parts list!

[@crewyou07]

Good day Dave, Yes I did have a few folks who have the 700R say they needed to Install a TCL kit. Glad to hear your conversion went well and my parts list and videos helped.

[@jd60palouse95]

@@crewyou07 - are you still running your distributor with the vacuum line blocked off. Have been running mine that way and so far seems to work fine but was wondering what the pros and cons are of running it one way or the other.

[@lewiscohen8919]

Thanks this video gave me all the information for my beast

[@crewyou07]

Glad it helped Lewis ! What are you running in your BEAST ?

[@Blade-hp9mn]

msd 6al with the hei, no module, was thinking about hooking the purple and white wire to the tach on the msd box. Thank you for taking time out of your day to help me, really appreciate it, thanks

[@crewyou07]

Yes you can try hooking it up to that point, or you can hook your purple and white wire to the negative side of the coil you are using. I just found this video, it may help more kzbin.info/www/bejne/mXjIg32Oa56cgtE

[@crewyou07]

Hey Kevin, was going through some comments and here is one I stumbled on, I forgot I had addressed this problem before and commented on it in another video, Here it is ; Hello Arron, I am not familiar with your MSD 6AL distributor, I just did a quick search on it tho. It looks looks that distributor has a separate tach output. So I would say no, you cannot. When I read the wiring instructions it looks like you need to splice the purple and white wire to the red wire on your MSD unit. I did read that the red wire needs a switched power source which the purple and white wire is.

[@thedobermangang3503]

good job my brother

[@1acostarat]

Great video, don't need to buy a trans controller from summit racing, now my question is why do I need to replace the distributor, the distributor control module controls ignition and fuel injection at the same time so if I'm going with a carb I just delete the injectorts harness or will it run bad I'm just curious

[@greatpeter00]

I did this swap and if I start the truck and put it into gear it works. But if I let it idle for a second I will not have any gears no forward or reverse. Any help would be greatly appreciated

[@Blade-hp9mn]

If your using the oil pressure switch, then take a piece of wire and plug it into both terminals on the plug, that will close the circuit and the pump will come on.

[@jenniferbravomarcano2880]

Amigo tengo un motor 350 Chevrolet tbi recién echo el problema es q en frío marca más de la mitad el medidor de aceite y luego viene callendo a 0 cambie bomba de aceite otra ves y nada quite el tapa válvula y apenas medio le llega aceite más no sale a chorrito le hice servicio al radiador cambie aceite nuevamente y nada. Ayuda q puede ser..?

[@realhorsegarage5359]

I have a brown tack wire that goes to tack side of distributor can I just add the purple and white to it for pump?

[@thomas0972]

I didnt switch to hei distributor. It works but I'm wondering if it's not running as good as it could be? Any advice

[@tomwolf4609]

Good job.thanks

[@daelanpellissier9670]

Did you get a check engine light from removing wires for map sensor and other things?

[@blakemoss6943]

Hey thanks man your video is super helpful, what cfm is the carb you ended up using? I’m thinking about buying a used carb and rebuilding it

[@senorbars]

I have a 93 c1500 and 5.7 with a 4l60e I have a comp cams 270h cam for it and want to switch to carburetor from tbi. I was told I need a standalone harness and computer for the transmission. But they are 900 bucks. The tps setup you did how can I do that. Do you have part numbers for what is needed? I'll be using a 650 double pumper. Thank you in advance

[@snixn3155]

how do you keep the ac working I have a 1990 that I daily and want to keep ac and cruise control

[@TheEleshoo]

Hello. This was really helpful! I’ve got a 92 that I just put a blueprint carbureted 350 in to replace the tbi equipped original motor. I just got it in. Just buttoning it up now. As you showed, I ran the purple wire with the white stripe to the tach port on the distributor. Where did you pull the battery connection on the distributor from? It’s just a hot with the key on? Probably a dumb question but thanks in advance for any advise. Great video!!!

[@crewyou07]

Good day, I am glad you found the video helpful. Your question ? I used the wire that connected to (+) side of my original coil. Have watched all 5 videos I posted ? The information on how I wired the distributor is referenced. Hope that helped.

[@jorgehernandez-pk3mq]

great and helpful video. I´m planning on a similar swap on my 1988 chevy blazer 350 ad have several questions: On what engine did you do your modification? What intake and carb did you use?

[@crewyou07]

Good day Jorge, glad to hear you found my video informative. I used a 1995 350 Jasper rebuilt. If you go to my TBI to Carb Swap Chevy Truck Part 1 or 2 you will find a complete list of everything I used in the description section of my video.

[@musiclovr2890]

im thinking of doin this to my 90 im having probs with, 1- why are you using the tps? 2 what did you do about the computer- 3 what about the cam? i see others on here but no one talks about these things, im thinking leave computer in just not using the fuel injection or the shitty sensors, but what about the computer controlled cam?, im assuming its still the same thanks for the videos ill make videos if i do it thanks again

[@teyes400]

I'm getting ready to do this. I pulled the engine and transmission from my 88 suburban,7004r. My question is can I do this set up with a mechanical fuel pump. The vehicle its going into is a 75 Chevy short wheelbase van. Great videos,..thanks.

[@crewyou07]

Hello Teyes, yes the mechanical pump is the better way to go. Less hassle in the long run. I wanted to use a mechanical pump but my engine block is a 1994 and the spot where the pump goes is blocked off from the factory.

[@michaelprevatte9967]

I'm thinking seriously about doing the TBI to Carb swap. I am going to a 383sbc. I have the carb with the TPS sensor already on. Do you have any other electronics still left on the truck. I am running a 4l60e transmission. How are you running the tach wire and which one is it?

[@crewyou07]

Good day. Only electronics is the computer and the tranny speed sensors

[@crewyou07]

I do not have a tach in my truck. I used the tach connectorr on my hei distributor to power my fuel pump

[@donavanswift4764]

I just did this swap and I have a quick question. Can I use the original plug for the factory tbi coil to power my hei distributor? By that I mean using the plug with the red and white wires red being the power and white being the tach wire ?

[@crewyou07]

Yes Donavan, I did the the exact thing. Used the red wire to power my HEI.

[@tmchevyman5319]

Great video is everything still working out good with the carb swap and is the transmission still doing good without any problems, just wondering if swapping to a carb has hurt your transmission i was reading a article about someone else who carb swapped there 94 chevy k1500 with the 4L60E and the trans went out about 1 year later they blamed the carb swap but i think it was probably just lack of maintenance or something else that had nothing to do with just swapping to a carburetor.

[@crewyou07]

Good day again TM, I have had no issues with my 4L80e transmission after I addressed the shifting issues when I first completed the swap, which was a defective TPS I got with my bracket kit from Holley ( make sure you set the TPS parameters correctly .5 to .7 at idle ) also make sure the trans speed sensors are working properly. I found broken wires on my speed sensor at the tailshaft. Those were my issues. I suggest watching all my videos on the swap because I go into detail on all the issues I ran into and my fixes.

[@patrickcurram9763]

Just want to say it’s weird that you have a 700r or a 4L60. Whatever you want to call it doesn’t have a TV cable. Makes the process so much easier

[@arnoldibarra4592]

My transmission not working. How do I make it shift. It takes off in 3rd I dont have 1st and overdrive gears. I did a Holley sniper conversion

[@michaelprevatte9967]

Great video...one question...Did you get rid of the other sensors in the system or did you just run off of the TPS sensor?

[@crewyou07]

Hello Michelle. I removed all the sensors. Yes I did have to use the TPS because I have the 4L80e transmission.

[@blindsheep5097]

I'm finishing a tbi to carb swap right now. 1990 silverado. How did you wire the fuel pump in order to delete the tbi computer fuel delivery?

[@crewyou07]

Hello Nathaniel, I cut and spliced the purple and white wire (tho it could be blue) from my four plug connector that was plugged into my factory distributor and ran the spliced wire to the TACH port as I show in the video.

[@JoseHernandez-kw6nn]

Hi My friend, good information, just one question, how many degrees you put the distributor? I have an engine like that with a quadrajet carb, pump is an AutoZone electric one, but still don't see any video showing the set up timing in a TBI swap to carburator engine. My truck is a C10 1970 Thank you sir

[@crewyou07]

Hello Jose, I had a reader chime in on question. He suggested 6 to 8 degrees before top dead center.

[@masonharmon1841]

I’m about to do with with an edlebrock Quadrajet. What did you do with the old tbi wires sensors and computers? Where do I put them? Love your channel keep it up!

[@crewyou07]

Hello Mason, I saved and wrapped most of the the sensor wires and took off all the sensors and put them in box. Tho I see that most I have talked to who have done the swap just cut all the wires and sensors and throw them away.

[@SKULLSNonprofitfirefly]

Before you put the tps on the choke did it start at really high rpm…….I swapped a 95 vortec 5.7 to carburetor and it starts at a screaming rpm

[@crewyou07]

Good day, I can not say I installed the tps and the choke on the carb before putting on my vehicle.

[@stupidlegos6485]

How do you have your alternator hooked up?

[@Blade-hp9mn]

Do you still have the oil pressure sensor install, if not the power side and the signal side needs to be jumped. If you re install the oil sensor and plugged it in the circuit closes and activates the fuel pump.

[@crewyou07]

Good day, yes I do have the oil sensor installed and operating.

[@MisterSirGabriel]

What did you do with the Purge line coming from charcoal canister that went to TBI? Thanks a ton for all the info. I got my Chevy running like a dream

[@crewyou07]

Good day Gabriel, I deleted my canister and your very welcome! I am glad you found my video informative.

[@jessefigueroa1097]

1) U have a tps are u still running the factory computer or do u have a after market like MSD atomic tcm? 2) ur running the factory fuel pump why do u have to rewire it and why is it going to the tach side

[@crewyou07]

Hello Jesse, (1) Yes I am still running the factory computer. (2) Yes I am using the factory in tank fuel pump and I had to splice a wire and run it to the tach port of my distributor. Here is a link to one of my videos explaining why kzbin.info/www/bejne/fZOxnYqne66Dj6M

[@technical_gaming6998]

How was you able to wire the tps up

[@mexicanboi2161]

So I’ve got a 1991 5.7 swapped carb just about the same but my heater hose is just disconnected, where should it go ? Behind or near the distributor or is it fine jsut being disconnected

[@crewyou07]

Good day, sure you can leave the heater hose or hoses disconnected if you live in a area where you have no need for heat or defrost? If not you should have one connector on the radiator (passenger side top) and the other goes to a port on the intake.

[@sheldonwhite1010]

what wires did you use i need to know the colors and where to find the one that turns on the pump and where to wire it to

[@crewyou07]

Hello Sheldon,the purple and white wire (it could also be blue) is located at the connector that plugs into the bottom of your factory distributor. It needs to be wired to a switched power source in order for your fuel pump to energize. I ran mine to the port marked "Tach" on the early model GM HEI distributor that I used for my conversion. Here is a link to another video explaining more kzbin.info/www/bejne/fZOxnYqne66Dj6M

[@oldschool-ef4jz]

The wires pictured on the video tittle , are they the wires coming from the fuel tank ? I have the same connection on the 87 that I'm currently building now , where did you run those wires because on mine I can apply 12v and power the fuel pump ( actually I have the dual saddle tanks only issues I'm having is key on power supply thanks steve

[@crewyou07]

Good day, Steve have been busy with a new project. On your application you do not need to do anything with those wires shown since you are applying your own power source to your fuel pump. I found it better to run power to wire at the 4 plug connector, in my case purple and white. If no purple and white it will be the blue one. Hope that helped.

[@oldschool-ef4jz]

I have 4 wires that run from the tanks ( I have dual saddle tanks) they run up the frame two go inside the cab the other two have a plug on the end ( not sure where exactly it orginally plugged in ) one is tan other is pink when I apply 12 volts the fuel pumps will run. My truck is an 1987 700r4 and the original distributor had the coil mounted in a bracket bolted to the intake, sorry if I'm not making any sense I can give you my phone number if you like , Thank you very much for the help and your time . STEVE

[@drejackson1000]

You spliced the purple & white wire?

[@axeaddiction796]

i went from TBI to Fitech throttle body when I did an engine swap. Now I am getting no power to fuse block. any suggestions?

[@ej2civicb736]

Prob got it fixed by now but check the ground wires to back of the head and back of block might have missed them or pinched them with the bellhousing on the transmission

[@steverose2405]

Nice work. What year and model Chevy truck? Which engine? How is cold start-up with electric choke disabled? How cold does it get where you live? Thanks

[@crewyou07]

Good day Steve, thank you. It is a 1992 Chevy K2500 with a 1994 Jasper rebuilt 350. Cold starts are not bad at all. Just when below freezing (not often) I have a work the throttle a bit to keep it running until it can idle on it’s own.

[@juansantiago8968]

I need a part # for the fuel pump regulator

[@rockclemons4745]

I did a ls swap but kept the 4l60e. The speedometer not working and transmission will not shift. I connected the tps and have voltage to it.

[@ej2civicb736]

What year transmission later 03 I believe and later have a input speed sensor in bellhousing both speed sensors have to be hooked up check your ground wires also

[@ej2civicb736]

If you are using the 4l60e that came with your older truck or new style that came with engine

[@greatsanders1719]

What did you do for you distributor ignition? Did you hook the pink and white wires together?

[@crewyou07]

Good day, no I did not hook the wires together. All I did was I took the wire (pink) that went to the positive (+) side of the coil and I hooked it up to the terminal marked (Batt) on the HEI distributor I used on my swap.

[@joelaidler]

Is there a way for me to hook up the throttle position sensor with a manual choke?

[@crewyou07]

Good day Joe, you most certainly can.

[@Blade-hp9mn]

can I run the fuel pump wire to a on /off switch or do I have to plug it in the tach port on the distributor. Thanks and great videos simple and clear.

[@crewyou07]

Hello Kevin, I would suggest using the tach port. All it takes is one time to forget to shut off the your fuel pump. Would hate to see you go to start your vehicle the next day and find a dead battery or worst...

[@Hc-mn4qp]

So I have a 95 Silverado tbi switched to carb but I noticed I have the cable Link for transmission but do I still need the tps for the carb

[@crewyou07]

Good day, if you have a cable coming up from the transmission more than likely you have a 700R4. But you must confirm that. If it is, then you will not need a TPS.

[@Hc-mn4qp]

We’ll come to find out got under truck and google number on transmission and it is a 4le60 trans maybe you can help me out what do I need to do

[@brianbaker2484]

I got a 94 can I delete all the computer wires on passenger side? I have a th350 trans.. I just wanna be able to run my all the lights/dash lights and heater. It's a mud truck basically.

[@crewyou07]

Good day Brian, yes you may. the only wires I would not cut out is the ones going the 4 wire connector that goes to the factory distributor.Tho, If you are using a mechanical fuel pump you can cut those wires too.

[@brianbaker2484]

I'm running a complete mechanical drive train. Nothing is computerized. But trying to figure out why none of my lights are working. I have turn signals and brake lights but nothing else. Checked the fuse box and everything has power but seems like it's not sending the power out. If I run a hot wire to the headlight switch plug I get my lights but trying not to hard wire it like that. Any ideas?

[@crewyou07]

Good day Brian, yes you can. Unless you are running the 4L60e or the 4L80e you will need to keep the wires for the TPS ( throttle position sensor.

[@brianbaker2484]

Ok awesome I'm running a 70s k10 motor trans and tcase all mechanical

[@waynew2831]

I am in the process of doing this swap on an '88 with a TH400 trans. What do I have to do to make the trans operate correctly?

[@crewyou07]

Hello Wayne. Since you have the TH400 the only thing you need to do is make sure you reattach what is called the “TV cable” aka the metal linkage that goes down to your transmission.

[@waynew2831]

There isn't one. One linkage goes to the accelerator, the other to the cruise control.@@crewyou07

[@wilfredoosoriojr.7880]

Whats that taped in duct tape? On the valve cover? Where did u attach the ground near the upper coolant house?

[@crewyou07]

Hello Wilfred, They are taped up wires and connectors from the TBI sensors. I saved them in I wanted to put a TBI unit back on.

[@crewyou07]

Oh, I used a stud with a separate nut in place of on of the intake bolts and attached the battery ground to the stud.

[@wilfredoosoriojr.7880]

@crewyou07 thanx I xant get my fuel pump running think I'm missing some grounds so I'm searching for all of them to see which I'm missing

[@TripleWhopperWithCheese]

What transmission you have?

[@daltonhersey1022]

I carbed swapped my 1993 Chevy and I’m having problems with keeping my stock fuel pump it turns on but won’t prime do you have an idea on what it could be ?

[@daltonhersey1022]

It’s getting no fuel

[@crewyou07]

Mmm, Okay. Stock in tank pump. You confirmed it is staying powered up while your cranking?

[@daltonhersey1022]

@@crewyou07 yes I figured it out I ended up having to wire into my oil pressure sensor so for now that will work I ordered a inline pump for 5-9 psi and I’ll be switching to that Wednesday thanks for the response

[@garlandmoney9310]

I am considering carb swap on my 89 C3500 dually flatbed. It has a Th400 tranny, not the 700R4. Is the shifting control going to change with carb? I bought a used Crate 5.7 which had an Edelbrock Performer dual plane intake. There is a transition plate, a Power Tower, then the stock TBI. I know I will need an HEI distributor, a fuel pressure regulator with gauge, and a carb. I have the regulator but need the gauge. I have a 1973 Quadrajet, a 750 cfm model from a Buick with auto transmission. (All that detail is from the numbers on carb body.) My question is does this require a new tranny computer, or not? That might be a deal breaker. I use this dualy flatbed as a hauler, and need some real power at times. I'm also torn about going to carb for loss of the 2 mpg you claimed you lost. This thing drinks gas anyway, and a carb might take me below 10mpg for truck only.

[@crewyou07]

Good day Garland, your turbo 400 is not computer controlled so will have no shift issues if you do the swap with all you listed. Enjoy your carburetor equipped 5.7!!

[@garlandmoney9310]

@@crewyou07 Carb swap completed, fuel lines replaced tomorrow, exhaust hookup tomorrow. Billet starter came today.

[@JoseRodriguez-kd1nt]

I’m having trouble with the purple wire not having any power any information you can give me ?

[@crewyou07]

Hello Jose, the wire should be purple and white, if not it will be a blue wire at the connector.

[@79chevyboylopez64]

Can I use a electric fuel pump, im doing this on the same block going in a 79 caprice

[@bluesteeljay9343]

Yes with a fuel pressure regulator thats regulated for a Carb. Look into his other vids. He shows his setup very detailed.

[@abelewis3471]

I'm trying to make a one belt pulley on a 400 SBC Chevy

[@tmchevyman5319]

have you noticed if your mpg has improved or gotten worse with switching over to a carburetor.

[@crewyou07]

Good day TM, I lost an average of about 2 miles to the gallon.

[@ghostrider8913]

Can you still used a tach even though ur running the fuel pump wire in the tach port

[@crewyou07]

Hey Ghost Ricer, I do not know? You could try. I do remember hooking up a tach year'ago on a vehicle with an external coil and connecting it to tne negitve side.which in turn made it two leads that were attached. I would try it and just keep an ear out for hard start or poor performance and make the call?

[@ghostrider8913]

Thanks crew for ur info

[@clintcomer8349]

I was able to hook up both the white factory tach wire and the purple/white-stripe fuel pump wire to the tach port on the HEI and everything works to include factory tach. 1992 1500 Z71

[@roddavis5494]

I have a question and need a little help I just did this conversion to my 92 suburban, but I swapped in a 385 stroker motor with a 750 Holley carb with electric choke and I also have a Holley 12-841 fuel pressure regulator. the other day Saturday the 27th I got my first start I started it then turned it off and then started it again and let it run for a min or 2 then it had cut off on its own and since then I tried to get it running again but it fires and just shuts off. So I am thinking I got an fuel issue I got the purple and white wire hooked up to the tach port but I dont think the pump is staying on maybe. I want to ask do I suppose to also have that white wire from the coil hooked up to the tach port also? Tomorrow morning I am thinking of proving my theory that the pump not running after the initial prime after turning the key by hooking a keyed 12 volts source to the pump relay green and white wire but if it still dont run any ideas to why it want stay running maybe I need to tune down the fuel regulator cause I did turn it up the other day or maybe an issue with my carb which I hope not!

[@crewyou07]

Hello Rod, you should only run the one wire to the tach port on your HEI distributor (purple and white) Question, are you using the factory in tank fuel pump? Also did you put a fuel pressure gauge on your regulator? You will be able to look at the gauge to see if your pump shuts off while running or attempting to start.

[@RayFixesAll]

Is your intake stock

[@nickygray4691]

When I look up the intake it says only 91 and I have a 94 do you think it would would

[@crewyou07]

My truck is a 92 but my engine is a 94. So yes, the intake will work for your application.

[@2sscole]

What bracket is that for the throttle cable

[@crewyou07]

Good day, please go to my video "TBI to Carb Swap Chevy Truck Part 1 or 2. Under video description I have listed everything I used for the swap including the part numbers. Let me know if you were able to find my list. Any other questions just ask.

[@wilfredoosoriojr.7880]

Does your have the crank position sensor on the front?

[@crewyou07]

Good day, It does not. The engine was a Jasper rebuild. My year truck did not have a crank sensor.

[@stevenzw1]

Thanks my fuel pump kept cutting out after about 5 mins

[@crewyou07]

Glad the video helped.

[@aaronmartinez2084]

I cannot find that carb you used. I'm thinking of getting an Edelbrock 1405.

[@aaronmartinez2084]

Nvm just found it, it was literally showing out of stock everywhere lol.

[@crewyou07]

@@aaronmartinez2084okay, I picked that carb because it was a 600cfm and were plenty around when I did my conversion.

[@jakemichael8586]

you need to connect the vacuum advance. you will get better mileage and the engine will cool better .

[@crewyou07]

Hello Jake, This is the reason why "I decided" not to run the vacuum advance kzbin.info/www/bejne/fZOxnYqne66Dj6M

[@xxxequalizerxxx3505]

Did you have to get a different cam to put in to put the distributor in

[@crewyou07]

Hello Shawn, no I did not have to get a different camshaft.

[@xxxequalizerxxx3505]

@@crewyou07 sooo... stock cam stock ECU? An how did u hook it up too bypass the opti spark

[@jeremysales1232]

​@@xxxequalizerxxx3505 he don't have optispark. You got a 96 or so Impala with a lt engine? Go to his videos and watch from the beginning of the swap. If you have optispark, look into swapping the engine to a different style.

[@martynobs6970]

I don't think your fuel lines are going to last. The electric pump is probably pushing 40PSI and a hose with clamps ain't gonna cut for long - you need to do it with metal line and compression fittings. Keep a close eye on that fuel line as you're likely gonna have leaks.

[@crewyou07]

Hello Marty, The rubber fuel lines I used are reinforced and the clamps are a solid band type not the perforated style. My fuel pump is not pushing 40psi, it is running about 14psi. Also living here in New England I make it a point to treat all the rubber lines in the engine compartment with silicone spray. I have not had any issues, if I do you will be second one to know, Thank you for your comment...

[@musiclovr2890]

fuel lines are around 9-13 psi with tbi they should be fine

[@crewyou07]

Thank you for the info ! I edited my previous reply.

[@westogarage]

hey @crewyou07 i just recently converted my 1990 chevy to carb, my speedo and fuel gauges don’t work, idk what to test for

[@baddbradd89]

Wire yours the same as his..... purple and white wire for fuel and t.p.s. for shifting

[@juliansaucedo9370]

What did you do with the return line?

[@crewyou07]

Hello Jullian, I am using the in tank fuel pump so I needed to hook it up to keep my fuel pump from burning out.

[@reddbulll7644]

By any chance do u have a fuel regulator part number?

[@crewyou07]

Yes I do. If you read the video description you will see everything I used for the swap listed there. Fuel Reg-Holley #12-842

[@reddbulll7644]

@@crewyou07 🤦‍♂️🤦‍♂️thanks

[@raemariesinzun9558]

Does putting a carb on it affect the ac?

[@crewyou07]

Good day Raemarie, yes it does. The most notable thing is when in drive at a stop the rpm’s will drop when the ac clutch kicks in. So you may have to run a slightly higher idle to prevent possible stalling.

[@Whelessry]

First of all, I am VERY appreciative of your 4 part series of your TBI to carb conversion. I have 1995 2500 chevy truck that used to be diesel and but now has a 454 (gas) big block engine and is carbureted. The guy before me seems like he knew what he was doing but I wanted to run his setup by you and see what you thought. I can post a video soon after I finish installing the heads if you want. Basically it has the original electric fuel pump in the tank, lines go to the mechanical fuel pump on the engine block,(thats the part Im confused about) then that line goes to a regulator, and two lines go to carburetor. Do you think it is safe for about 60 psi fuel to go to a mechanical fuel pump? Seems like I could just have them go straight to the regulator. The system seems to work but Im worried that the mechanical fuel pump will fail and cause gas to flood my engine or something. (Sorry for the story but advice would be appreciated) your setup is very close to mine, I have a Holley carb, but original computer is NOT in the truck. I have a new transmission computer that tells my transmission to shift gears.

[@crewyou07]

Hey Wheless, I am glad you thought the videos were helpful. After reading your comment concerning the way the guy before you ran both the in tank and mechanical pumps is a bit perplexing tho is it a dual feed carb? That would explain the 2 lines. If I were you I would go with just the mechanical pump. That way you can eliminate the in tank pump and the regulator and more than likely get rid any potential for a flooding problem. The only reason I did not go with a mechanical pump is because on my engine the opening in the block for a mechanical pump is non existent. Yes please post a video of your set up I would very much like to see it. As far as the double digit psi going to the mechanical pump before the regulator? Sounds like trouble to me. Tho before you take that to the bank I need to research that plumbing set up. thanks for the kudos and hope the head installation goes smooth.

[@Whelessry]

Thanks for the reply. The guy who built it is my father in law, it has had a blown head gasket for three years (it just sat in the yard) but he said I could have it. I took the heads off over the weekend and theyre at the machine shop now being cleaned and tested. It is a dual feed carb, multiple lines to go mechanical fuel pump and only one line goes to regulator, im thinking one of the mechanical fuel pump lines go back to the gas tank like a re direction setup but im not sure yet. Its just something I noticed when I was taking the heads off and I knew it didnt look right

[@crewyou07]

@@Whelessry Hello Wheless, Have been looking if you posted a video yet of the head refurb on your 454? I re read your post and thought about why one of the fuel lines from the mechanical pump is going back to the tank. The reason I believe is was plumbed that way because the factory in tank pump needs a return line back to pump to keep it from burning out. Hope to see a video with the truck running!

[@Whelessry]

@@crewyou07 Hey man! I took a 4 month break from the truck, but I'm back at it again. I just made a quick video on the fuel system set up, the engine is out right now but it's coming along kzbin.info/www/bejne/qXvFopiredOipsk

[@jasonlajuene2036]

direct bolt on new intake ? No mods needed ?

[@crewyou07]

Good day, yes direct bolt on no mods. Intake is made for the newer style heads.

[@QdotRich]

Did you run your own return line?

[@crewyou07]

Good day Quinton, I did not have to run my own return line.

[@Blade-hp9mn]

I did a complete engine swap, connected the wire you suggested and veh started up runs for a few and then shuts off, no fuel in the filter, cycle the key a few times and it starts back up and then shuts back. I was told I might have to run the oil pressure sending unit or splice it to run because the pcm is not reading oil pressure and it's part of the fuel pump wiring diagram. Any help. Thanks

[@crewyou07]

Ok, diagnosing from a far may take a bit. First off I ran into that same problem with my swap. You spliced into the 4 wire connector yes ? What color were the four wires ? Another thing, I would first check to see if you are even getting switched 12 volt power to the wire you spliced into. Check with key off, then check with key on. Let me know what happens ?

[@crewyou07]

Hello Kevin, I re -read your question. I know you said you ran your purple and white wire to the tach port. My question, are you using a factory GM electronic ignition with the coil in the cap like mine or something different ?

[@paulreis553]

Part number on the tps bracket

[@glenndolph]

Did the mpg change? better or worse?

[@crewyou07]

Hello Glenn, since my TBI unit was not operating optimally (the reason for the conversion) my mpg actually got better.

[@Blakep7704]

Are you running any advance on the HEI?

[@crewyou07]

Good day Blake, no I am not using the vacuum advance at all.

[@heathgeorge6418]

Wat was part number on intake for the tbi swap

[@crewyou07]

Good day Heath, the entire list of parts and numbers are in the video description section. Here is part of that list, Carb-Holley 600cfm #0-80457SA Intake-Wieand Street Warrior #8126 Fuel Reg-Holley #12-842 Kickdown lever (Turbo 350-400-700r)- Holley #20-121 Accelerator and kickdown bracket-Holley #20-95 TPS Kit for auto trans-Holley #534-202 Throttle stud-Holley #2038

[@heathgeorge6418]

Thanks u very helpful...

[@bartbarnett2811]

I don't know why but this guy reminds me of bubbles from trailer Park boys

[@bludhoun9016]

How do u get the ac clutch to engage

[@crewyou07]

Good day, Good question ? I was hoping to be able to get A/C operational, but I have not tried to diagnose it yet ?

[@TheNewkidsrule]

What manifold did you use ?

[@crewyou07]

This list is in the video description Carb-Holley 600cfm #0-80457SA Intake-Wieand Street Warrior #8126 Fuel Reg-Holley #12-842 Kickdown lever (Turbo 350-400-700r)- Holley #20-121 Accelerator and kickdown bracket-Holley #20-95 TPS Kit for auto trans-Holley #534-202 Throttle stud-Holley #2038 Distributor-Factory GM HEI - Accel Cap and rotor kit #8122 Plug wires-Carquest #358126 - Thermostat gasket felpro #35062 Carb gasket- Mr Gasket #54 - Carb studs- Mr Gasket #6345G Intake bolts-Mr G#6080MRG - Header bolts-Mr G #917 Wire Seperators-Mr G#9728 (2) - Throttle springs-Dorman #59207 Fuel pressure gauge-Mr G # 1561 - Air cleaner stud kit-Mr G #6399 fittings for regulator- 3/8 NPT to 3/8 barb 90 Spectre #5946 (2) 3/8 NPT to 3/8 straight Spectre #5945 Heater hose fitting- 1/2 NPT to 3/4 barb straight- Irrigation store Brake booster fitting- 3/8 NPT to 1/2 barb 90- Irrigation store Heater hose- Carquest 3/4 - 50' #CQ1727 - Intake set-Felpro #1204 3/8 fuel line - 3 feet 5/16 fuel line - 3 feet 3/8 hose clamps (4)pack #AC5F16V 5/16 hose clamps (4)pack #AC52F13V 1/4 hose clamps (4)pack #AC52F13V Permatex RTV black-#22072 and an Oil and filter change.........

[@robinkirk1165]

Why don't you guys start you show with taking off the old intake and showing the whole process of the swap

[@jeremysales1232]

But he did. You didn't start at the beginning.

[@timothycranfield5969]

What intake did you use

[@crewyou07]

Hello Timothy, I just cut and paste this list from my video’s description section: Carb-Holley 600cfm #0-80457SA Intake-Wieand Street Warrior #8126 Fuel Reg-Holley #12-842 Kickdown lever (Turbo 350-400-700r)- Holley #20-121 Accelerator and kickdown bracket-Holley #20-95 TPS Kit for auto trans-Holley #534-202 Throttle stud-Holley #2038 Distributor-Factory GM HEI - Accel Cap and rotor kit #8122 Plug wires-Carquest #358126 - Thermostat gasket felpro #35062 Carb gasket- Mr Gasket #54 - Carb studs- Mr Gasket #6345G Intake bolts-Mr G#6080MRG - Header bolts-Mr G #917 Wire Seperators-Mr G#9728 (2) - Throttle springs-Dorman #59207 Fuel pressure gauge-Mr G # 1561 - Air cleaner stud kit-Mr G #6399 fittings for regulator- 3/8 NPT to 3/8 barb 90 Spectre #5946 (2) 3/8 NPT to 3/8 straight Spectre #5945 Heater hose fitting- 1/2 NPT to 3/4 barb straight- Irrigation store Brake booster fitting- 3/8 NPT to 1/2 barb 90- Irrigation store Heater hose- Carquest 3/4 - 50' #CQ1727 - Intake set-Felpro #1204 3/8 fuel line - 3 feet 5/16 fuel line - 3 feet 3/8 hose clamps (4)pack #AC5F16V 5/16 hose clamps (4)pack #AC52F13V 1/4 hose clamps (4)pack #AC52F13V Permatex RTV black-#22072 and an Oil and filter change.........

[@catdakman1273]

Anyone know Ashly Roachclip from Cheech& Chongs acapulco gold filters.

[@catdakman1273]

Ashly Roachclip, nice video.....lol

[@crewyou07]

Thank you Cat, my pleasure to share..

[@Blade-hp9mn]

I'm running an after market oil pressure gauge .

[@crewyou07]

Are you wiring the gauge straight to the sender ? or trying to wire it up via the harness ?

[@Blade-hp9mn]

via the harness

[@Blade-hp9mn]

I see the 3 wire plug for the oil sensor, but don't know which wires to splice.

[@Blade-hp9mn]

purple white, red black, white, orange black.

[@crewyou07]

Right, the purple and white, Ok Kevin, you need to answer the other two questions I ask before "I" can move to the next step to try and help, Thanks..

[@killercoyote3445]

Do you still need a map sensor

[@crewyou07]

No you do not if running a carb

[@supersix-four9509]

Anyone ever tell you that you sound like Fat Tony from the Simpsons?

[@Blade-hp9mn]

I have a 1995.

[@crewyou07]

Kevin, make sure you re-read my replies because I did edit and add more content. Good luck..

[@baddbradd89]

Your video is the best for TBI to carb conversion ...... The others are stupid

[@crewyou07]

Thank you BaddBradd ! I made this video to try and put all the info I accrued to do this carb swap in one place..

[@bluegrasslives]

DO U have a COLD!!!!?