Converting TBI to Carburetor, tips and tricks

Converting Your TBI to a carbuator isn't that difficult as long as you know what you are getting into. This is a short vid explaining what you need to know before you start this project.

[@LemmyK72]

After 15 years of nonstop issues...throttle body electrical, sensor, regulator, etc., ...I'm done with TBI. I love my old truck , a 94 chevy 454, but hate TBI with a passion. When I was young I had a 79 ford f150. Just a plain old 4 barrel carb, on an edlebrock manifold and that motor always ran...no issues. Thanks for the video Brother. I'm changing back to carb.👍

[@carsonc007]

We have been chasing our problem for 5 days on this pickup and would like to say thanks for the help!

[@brandenj576]

This was exactly what I needed. My k1500 has something wrong in the knock sensor circuit/wiring and after replacing nearly all the sensors its time to go back to a simple, reliable, mechanical solution. Thanks again, awesome video, especially about the fuel pump wiring.

[@stevemiller8952]

Rusty just seen your video. I’m in the tree business and my Son and I have a 1997 gmc top kick with a 366 gas engine with a throttle body. It is our main bucket truck we use in our business. It starts but idles very roughly for 5 minutes or so then it smoothes out enough for us to drive to the job site to do our work. We have a pony motor that operates the hydraulics to run the boom. We have been having issues with it for around 6 months now. We’ve spent $3 to $4,000 on it so far changing out everything there was to change out. All the sensors, new throttle body gasket, tune up of plugs, wires, distributor, fuel pump, coil and everything else we could think of. We have someone who done this on a truck like ours and he said it runs great. He is going to do this to our truck. I’m glad I seen your video p, it was very encouraging to me. We are hoping to get our motor running great again. The only has about 105,000 miles on it. Thanks for your video, Steve Miller

[@redneckwithajeep5001]

Glad I found this. Not running a carburetor on my 88 but I just bought a 94 for parts because it has the tow package and better brakes to put on my 88. I needed this information because I plan on dropping the 94 350 into my 66 Belair while I rebuild my 283

[@crazzylyle99]

I was wondering if u can do a better video on the wiring for the the distributor and for the fuel pump to stay running

[@mr.cutlass87delgadillo.d45]

Do u figure out wiring it’s were im stuck at..

[@melbydobson9980]

Thanks for the information about the fuel wire to tack side of dist. I was thinking it would work off the fuel pump relay! I really like your video, it has helped me. Thank you.

[@mikepolk3361]

What kind of issue were having?Im asking to see if yours is similar to mine

[@melbydobson9980]

Once again I really like this video. I thought that all I needed to do was hook up the purple wire to tack side of dist. and all will be good to go.Wrong, you still need the fuel pump relay hooked up at least this is the only way my fuel pump would work. And the car is running great, all finished. 1986 corvette, and only using it for drags at the 1/4 mile race track. I hope this may help someone on the fuel pump! Thanks.

[@melbydobson9980]

@@mikepolk3361 Hello mike, I just wrote a about the wire to dist. for fuel pump and in my comment I said that I also hooked back up the fuel pump relay and this is working great now! With out the relay I was not getting any fuel only a prime for 2 seconds. Hope this helps!

[@gameboy3800]

doesnt the c in c1500 mean its 2wd? you probably meant k1500

[@jamesahr2634]

Thank you for pointing out the tac wire. Just did mine 87 chevy 454, used original intake with carb spacer.runs 90%better.everybody talks about the tbi to carb , but don't tell you about the wire hook up thanks.

[@bigpigslapperoinktoo4953]

Yup,, I just ran across this video point'n out the purple wire,, went out n found it,, gonna try it tomorrow,,, them forums aint all they crack'd up to be are they,,

[@michaelbraun8074]

@@bigpigslapperoinktoo4953 I hooked purple and white wire to the tach port and the pump did not come on i stuck my test light in the wire and it came on strong for just a few secounds and quit, if i pull the test light out and stick it back in it does it again, any thoughts??

[@bigpigslapperoinktoo4953]

@@michaelbraun8074 I have none,, mine is still goin,, when I spliced it in,, it aint stop'd,, I have no clue,, I was gonna drop the tank,, mess with the wire'n and possibly put a Holley red pump on it before I saw that dudes video,,, I almost went mechanical fuel pump if the Holly red didn't work bein it's so old,, I pray ya get it figured out,,

[@michaelbraun8074]

@@bigpigslapperoinktoo4953 I just hooked it up to a hot wire by itself and it still came on the same

[@btown217]

Question, I'm learning as I go, I have a jasper 350 engine out of a 95k1500 I'm putting in my 85k 20, do I just need to swap all the fan,water pump, power steering off my old engine for belts and would a Edelbrock 2104 be the correct intake to use to go carb?? Since everyone is telling me the intake that's on it won't work?

[@robs_garage0278]

This video is sure helpful thank you ive been trying to figure out the fuel pump wiring because i have a 1992 gmc c3500hd that im changeing over to to carb because the tbi is failing so bad the truck would run so lean that it doesn't have the power to go up hills

[@darrenoerlemans7358]

Oil pressure switch sees pressure and keeps the fuel pump running after the initial prime. Needs to be plugged in on the back by the dizzy,,, if your motor has one.

[@SShakeyBoy]

"You got a good motor, but your electronics suck", classic truth.

[@bigpigslapperoinktoo4953]

Been have'n trouble with run'n out of fuel,, the purple wire I hope is my problem,,,, will give that a shot tomorrow,, went out n found the 4 pin connector with the purple wire w/white stripe,,, Thank God He Led me To your video,,,, Thanks for the info,, hope it works tomorrow,, God Bless

[@bigpigslapperoinktoo4953]

Works like a charm,, thank You for the video,,

[@CBR_Engines]

No ur problem is u listen to a stupid mfker. Go get a mechanical pump. And problem solved. All 350s pre vortech. Can have a mech pump bolted to the block they just put a plate over it. Fun fact the tbi cams HAVE THE FUEL PUMP LOBE. ALL U NEED IS THE SHAFT. PUMP AND GASKET. PROBLEMS SOLVED FOR EVER. NOT ONLY THAT. But your fuckin factory pump pushes way to much fuel pressure to a carb thats ment to get 5psi really of pressure. Ur gonna ruin ur carb and constantly have issues. I dont care if u go put a inline regualator u can set fuel pressure. Dont work.

[@ricobautista622]

4l60e has that cable under the throttle cable as well. If that cable goes to a box on the firewall it controls the cruise control.. just so nobody gets confused after watching this video when they go look and the cables there on a newer trans truck 👍

[@kanekochera57]

95 and after has a 4l60e I believe, My 91 has a 700r4

[@melbydobson9980]

The purple with white stripe to dist. was all I did and with no luck hooked up the fuel pump relay and it works great!

[@jeremybaer364]

I hooked purple wire up and when I turned key on I get nothing. No sound just cruckets.... thinking of just running to toggle

[@GarySnapp-j1m]

Thanks for this info, I appreciate it.

[@hiedianderson5421]

Rusty really liked your video you explained it clearly and very comprehendible. I'm going to change the manifold to carbetsted on my 93 gmc 4x4. Z71 with 350 but I changed the 700r4. Like you said chasing phantom problems to have any tips for a manual trany manifold switch? I subscribed to your channel. Thank. You again.

[@Try186]

Do you unplug the old computer,do you’ve the part number for the fuel pump regulator?

[@suzukirmrm450]

Thank you so much I fully converted my truck and I love it now it peels the tires off do this conversion I have one question do I disconnect the old timing advance wire as it does impact the initial timing to your hei

[@savagenomore]

I'm having the exact issues you described near the end of this video, put a brand new engine in and it has ran like shit since, changed every sensor there is and have come to the conclusion there's wiring issues in the tbi system, idle is erratic all over the place and I can't get it to stabilize so now I'm weighing out switching to carb setup or tracing the wiring issue...

[@daltongrayson8513]

Did you ever figure out why it’s doing this? Mine has been doing it for 1 year but seems it only does it when it wants too. Like one week it’s running like shit and the next it’s perfect.. I’ve tried locating naked wires I’ve changed throttle bodies, distributor +(cap wires and spark plugs), coil, every sensor on the damn thing, fuel pump and filter, and have looked over the ecu wiring behind the glove box and still acts up sometimes.. it was my grandpas truck. Had it every since I was 5 and he gave it to me when I was 16 and I would do anything for it to run right .. please let me know if someone has solved this! Thanks.

[@brandonvansel3716]

@@daltongrayson8513 my 99 is the exact same way,I've figured out outside air temperature effects it.At first when it's cold runs like ass.ten minutes of driving and it's mostly normal.Just not the best setup

[@daltongrayson8513]

@@brandonvansel3716 have you changed the temp sensor on the intake?

[@brandonvansel3716]

@@daltongrayson8513 yes.Ive changed pretty much everything at this point.The other thing that does this is to much air at the maf

[@daltongrayson8513]

@@brandonvansel3716 I’ll try to figure out how to post a video of what my truck is doing on here and tell me if yours is doing the same thing

[@XLR8NXS32]

Thank you very much Sir. I hate the computers and I know that I will make my 89 K5 Blazer run like it should with the tried and true method of a distributor and carburetor. 🙂

[@wilfredoosoriojr.7880]

Do you have video on your vacuum lines on carb and from the booster to carb?

[@moeney2811]

I pretty much have the exact same set up intake and carburetor, I was curious what did you set your overall idle timing to? I know the TBI computer adjusted it on its own so I was curious what timing you went with. Thanks in advance.

[@reinaldomartinez60]

I've got a 95 GMC K1500 4x4 Iswapped from TBI to carb and am having difficulty with my 4L60 Trans, it doesn't switch gears. How can I fix this problem?

[@joshlarntz]

I'm having issues with my conversion. Every time I put it in gear, it shuts my truck off like it kills the fuel. I am running a mechanical fuel pump.

[@BlackCherrySledPulling]

If you leave the tbi wiring harness in place and guve it the tach signal, hook the map sensor to the new manifold, and fit a throttle position sensor to the carburetor the 4l60E should shift fine

[@vandaweritz3349]

I've been on the forums gathering information for a carb swap I'm doing on an 84 vette this is the first time I've seen a clear straight forward answer on this fuel pump wiring thanks so much for making this video!

[@seancainey3979]

Same here

[@shariii876]

Im thinking about doing this on my geo metro but I don’t think the distributor swap is necessary

[@mortthomsonjr.2505]

Can you assist on instruction for how to attach the linkage to my Rochester 4 bbl on my new 2104 Intake?

[@reynardstewart5939]

Can you by pass the knock sensor when you do the conversion?

[@andyhernandez3041]

Good video. Friend can you tell me where I should connect the distributor coil cables so that after starting the engine I can also turn it off by the switch.

[@Electrains]

Building a carbed engine for my 91 k1500. Great video! Thanks for the tips!

[@realWideOpenThrottle]

@Dawnstriker I'm trying to do one on the same year and truck as you, any tips or things you learned/problems you ran into?

[@Electrains]

@@realWideOpenThrottle actually I haven't even gotten to it yet. Setback after setback.

[@realWideOpenThrottle]

@@Electrains No problem, I've been looking around on forums and other places to see what others have come up with. Thanks for the reply.

[@road2richz_q266]

@@realWideOpenThrottle I did a carburetor swap on mines I have a 1990 K1500 350 how far did you get on yours?

[@realWideOpenThrottle]

@@road2richz_q266 I actually finished it. Truck has been running for a good while now, has the occasional rough idle most likely due to the 87 octane gas I keep throwing at it. Too cheap to buy the good gas. Otherwise it runs perfect.

[@aliaswizard6963]

Do you have the same fuel tank or did you have to change out with a return style fuel tank?

[@claudebobbitt7345]

Do I. Need to hook up the electronic kick down on my 1988 gmc it was to and someone made it carburetor but never hooked up the electronic kick down I have the 700r4 transmission mine also has a another kick down cable on it that’s on the passenger side of transmission

[@casanovatacos]

Your video is exactly what I was looking for. Thank you so much. So, I got all the parts but I have a question as to what hei distributor did you use...do you by any chance have the brand and number? I thank you in advance. Thank you again for the informative video. 🙏

[@tlariscy]

Any HEI distributor for a 350 should work

[@dennisowen3717]

Good info but I hope you hooked up the Throttle Valve cable from your 700R4 Trans to the Carb and had it adjusted correctly. Otherwise you'll burn up that 700R4 real fast.

[@jimjones_koolaid]

Good vid and info.. Im pretty much decided to do the swap on my 91 camaro and ive watched a few videos already and it seems like they all say thr same thing,, that theyve kept the factory computer to operate the temp switch for the cooling fan. So my question is.. If ive already run the cooling fan to a toggle switch, is there any other reason for keeping the ecm? Cuz this thing is a wiring nightmare and im ready to just rip it all out 😂

[@thedobermangang3503]

looking at your video i didnt see no out let on your pressure regulator for the vacuum hose

[@tlariscy]

The pressure regulator does not use engine vacuum. It’s a racing style mechanical fuel pressure regulator.

[@jorgehernandez-pk3mq]

I really like your video. Clear and straight forward. I am planning on doing a similar swap on my 1988 Chevy blazer 350 5.7L. Watching your video and comments I had a couple of doubts. Did you use the 2101 or 2104 intake from edelbrock? What carb did you use? and did you change to a melinized gear on the distributor to protect the camshaft? THANKS FOR SHARING.

[@tlariscy]

Hi Jorge, I used the 2101. The only reason to change distributor gear is if you have a roller cam setup, then you would need to use a bronze gear. I used a Holly 600 cfm with electric choke. Had to use adapter to make intake square bore.

[@codylindabury5168]

@@tlariscy do you remember what adapter? And where to get one? About to attempt on my 88

[@wildestcowboy2668]

@@tlariscy hey man I got a 1989 with a rod knocking in my 350. I've got a 78 with a beast of a 350. Can I just set the whole engine in there sir?

[@tlariscy]

@@wildestcowboy2668 shouobe an issue. Just got to provide fuel and spark to be good to go. Not sure on the motor mount match up, but that’s not too hard to adapt if there are any difference.

[@sanj8127]

I have the same setup same carb I just did my swap carb yesterday I ran purple and white to tach and battery side to key turn on also directly to hot truck cranks when given gas but the pump cuts off

[@918swimbikerun]

What do you do about the electrical wiring for the rest of the truck? How does that change with a carb?

[@tlariscy]

Hi Steven, you will still use all the engine sensors like water temp , oil pressure Ext. All the plugs for throttle position , map sensor ect will not be used. I cut mine off. Be sure before cutting anything that everything works like it is supposed to. Better safe than sorry.

[@jeffguy9982]

Like your vid! You didn't have to mess with the fuel relay at all? So you just connected the purple and white cable to the tach port right? So this way it will run the fuel pump like normal? Thanks.

[@tlariscy]

Yes, straight to the tach port. Keeps fuel pump running. No issues

[@jeffswarts6425]

How much did everything cost for conversion and where did you get it

[@cgonedfishing]

I have a 95 K1500, did you leave the stock full pump in the tank? I assume you did based on the regulator.

[@SteveKing-qy3fq]

Do the service engine lights come on after the swap out

[@garykentner7557]

GM rocks try to do a conversion to a Ford it’s complicated as for Chevys can swap clear back to 1955 Im not picking on Fords but they are a pain to try to swap out things unless you have the specific year sometimes. Those engineers have too many ideas keep it simple.. tried and true great video long live the HEI and Carb👍🏻

[@TheMajictech]

“Gm rocks” that’s why everyone is here trying to get them to run, or be reliable or both. 😅

[@TheMajictech]

If you haven’t converted a 5.7 tbi to carb yet they won’t take the ignition timing a conventional carb engine will because of the combustion chamber shape. They rock alright, 1/2 the motor is rocking the scrap bin to make them proper unlike the fords.

[@cliffharris1447]

How do you got your chock set up?

[@luckeycat_]

Do I really need the return line to be hooked up? Can't I just block it off?

[@tlariscy]

Yes, as I understand it. Without the fuel being able to return to the tank the fuel pressure will build until something between the regulator and fuel pump fails.

[@luckeycat_]

@@tlariscy Ahh, oh. Thanks!

[@oldschool-ef4jz]

No you will have to get a fuel pressure regulator and lower the pressure , without a return line it will flood the engine with fuel

[@mikesmith0691]

I have a 1988 Chevrolet k 1500. Rebuilt motor and doing the TBI to carb swap. Brand new HEI distributor. 12-volt to battery on distributor

[@mikesmith0691]

Purple and white wire to takw Port. Fuel pump not running it was before

[@DaveBukovan]

Thanks for the video, it was very helpful. But need help. I completed the efi to carb conversion on my 96 silverado and am utilizing the 4l60e. I used the holley tps. Tried to set tps to .5 at idle and can't get the wot higher than 3.8 and doing so changes the idle to 1.8. It goes without saying g the trans starts out in second gear. I can not find the purple with white stripe wire in the plug which went to stock dist. Or for that matter anywhere else in the engine wiring harness. I even had an additional wiring harness from a 96 and couldn't find the wire in it. The engine I installed does not have crank sensor. Can you please help?

[@michaelfazio5754]

I have a 1995 Chevrolet Silverado. I am removing the TBI. I am a little confused about the fuel pump issue. My Chevrolet crate motor doesn't have a mechanical pump on it. You have to run a fuel pump with this motor. I purchased a Jegs 110gph/lph. They are telling me I don't have to drop the tank and remove the fuel pump. Is this true or not. Everyone has different answers. Can I remove the return line, I do believe I can. Can you help me out? Thank you in advance. Mike F..

[@tlariscy]

Hi Michael, you should just use the existing fuel pump that is in the fuel tank and use the pressure and return lines that hook up to your TBI. You will need to run the pressure line through a high end fuel pressure regulator and dial the fuel pressure down to about 6psi. That being said you will want a pressure regulator with a bypass, it will have three hook up’s. One for the pressure line from the tank, one with the regulated pressure going to the carb and the bypass going to the return line for fuel tank. Pay special attention to the part in video about wiring up the tach connection to HEI distributor. This function is what regulates the fuel pump turning on and off based upon engine RPM. Skip this part and you will be able to start engine but it will shut off when carb runs out of fuel because fuel pump did not continue to supply fuel past the initial prime up when you turned on your key. Hope this helps.

[@michaelfazio5754]

@@tlariscy thank you Walt

[@Isabellrice]

Been looking for diagrams and videos on how to wire the fuel pump the right way verse just wire it to a switched hot or a toggle switch. Does that bypass you're fuel pump relay? You're fuel gauge works?

[@BerdManLoak]

What are the color of wires that go to the starter. I removed my whole engine to rebuild inside out and forgot to add name tags to the wires

[@leoyanez8632]

Which wire do I use to put on bat side of the distributor and which cable to I use for the electric choke ?

[@rileytumilson400]

My biggest question with this swap is if this will affect any of the gauges on the dash, im considering a carb swap for tuning reasons, but i have a fully functional gauge cluster and id like to keep it fully functioning

[@AltonCarter-og5gr]

Where can I find a fuel regulator setup

[@briancorbett6644]

Hi, i have a question. I have a 89 Chevy Extended Cab Silverado C1500 with a 350 and I'm in process of doing the same carb swap. My question is...there's a hose with like a nut type piece where you can put a wrench on to and it attaches to some short of a fitting that im assuming goes into the intake area of the block. would i have to remove the fitting in order to do the carb and intake swap?

[@roberthedges2925]

Why the purple and White wire for the fuel pump and not other ignition activated wire?

[@tlariscy]

The wire does not power the fuel pump, the ECU reads engine rpm through this wire then the ECU controls the fuel pump according to engine rpm.

[@roberthedges2925]

Thank you that makes sense

[@romeoweeks2702]

I got back pressure going to my fuel pump and killing the pump if I give it 15 30 mins it will start back up and I’ve watched so many videos and no one else is running into the problem other than me only happens when I drive for like 15+mins

[@dstill3597]

Lots of questions! What carb? I know the flow of the heads is crap. Have 1989 C1500. Motor was rebuilt with Comp cam (5000rpm)and roller valve train. Suddenly have no high end. What linkage kit? (I have 700R4). Where is the timing? Does yours have more power over the TBI? Thanks

[@channinghayden6942]

Thanks for the how to vid

[@gwe87]

Thanks for the video! It was really informative. I have a 1984 Ford LTD Crown Victoria with a 5.0L engine. Do you know if you can convert a Ford the same way as a GM? Any tips are appreciated. :)

[@fu6650]

How would you hook up an electric choke

[@tlariscy]

Hi Frank, the carburetor should come with one. You would just hook a switched wire that is energized when ignition is switched on. The other terminal on the choke will go to ground. Hope this helps.

[@todsutherland8243]

We are just now completing a similar conversion on my son's 91 Silverado. We went with carburetor heads, because our valve seals were bad and different intake but similar distributor and carburetor. Was just now fighting trying to figure out how to power the fuel pump, our only hurdle before starting this motor. If I understand correctly, and its great information, all I need to do is run that wire from the distributor plug to the tac wire from the coil And the fuel pump will operate normally?

[@tlariscy]

Yes, the computer uses that wire to sense engine speed so that the voltage to the fuel pump is regulated to supply appropriate pressure from the pump.

[@todsutherland8243]

@@tlariscy Thank you so much for the very valuable information. We took the info in your video and were able to finish up the minor wiring for the distributor and the fuel pump in just a few minutes. We did get the engine fired but are having a bit of a vacuum leak issue we are working on. One thing we have different, another post had referenced the part number for a mechanical fuel pump that they used in tandem with the electric. The tandem fuel pump has a return and according to the poster it automatically regulated the fuel down to the 5 psi needed for the carburetor. We have everything hooked up, it appears to be working but at this point I believe I'm going to add a regulator between the mechanical pump and the carburetor for safety.

[@thrashersk83r]

Does the purple and white receive power with key on? I have my tester out and it’s showing nothing

[@tlariscy]

It gets signal from distributor and takes it to ECM. It does not power anything, the power is then sent from ECM to fuel pump

[@thrashersk83r]

Thanks for the response. Ended up running a electric fuel pump. For some reason it never sent signal to the factory fuel pump.

[@patrickking3489]

Is that a regular intake or a vortec intake

[@suicidegarage]

Sweet thank you you're my hero 😂 but fr lol I did a bunch of work engine wise heads intake like that and I was trying really hard to use my throttle body but I don't think it's going to work so this is helpful thank you very much

[@graveyardrumblers]

What initial timing do you run with this setup?

[@danvertdavis6867]

Can you put a old mechanical fuel pump on the block or did they remove that provision on the block??

[@tlariscy]

Should work

[@mikepolk3361]

I’m in the process of doing this and my car starts then runs a few seconds and shut off

[@2010HarleyDynaFXD]

I did the same swap with my 93 Cadillac Fleetwood for the distributor all I found is a pink wire and a white wire I hooked up the pink wire to bat on the Hei Distributor and the white wire on the tac/green wire on the Hei distributor can't find a purple wire anywhere.

[@tlariscy]

Not sure how the Cadillac is wired. My experience was only with the C1500. Sorry I couldn’t be more help on this.

[@2010HarleyDynaFXD]

@@tlariscy Sorry I found out what the problem was it was out of gas and the gas gauge was off by a quarter tank lol

[@allgasnobrakes4979]

Did you have issues with the side intake bolts with the angle of bolts

[@euclid47pha]

Excellent video. Ty

[@kenjuicekrajewski9577]

So you think keeping the fuel pump in tank is better then running a mechanical pump on the block??

[@tlariscy]

Either way will work, just didn’t want to pull pump out of tank and replace with non pump pickup and fuel level sending unit.

[@joerodriguez2180]

How you doing today I like what I heard right now sound like you know what you're talking about my question is what would be the issue if I ran the mechanical fuel pump if I didn't want to get the pressure regulator for the fuel what are the cons on using the mechanical fuele pump

[@kenjuicekrajewski9577]

@@joerodriguez2180 ran mechanical pumps on 5 cars up to 600 hp. Works great. Simple. No wires no sensors. But everything has to be eliminated if it's a fuely car that's the key. Having everything work after everything is gutted also. Can do that if it is a year or car that does not need any emission testing like here in connecticut classics you can gut sensors. Cats and make it simple and fast

[@tlariscy]

@@joerodriguez2180 hi Joe, I considered doing the same thing, I just didn’t know how the factory fuel pump/ sending unit/ fuel pick up in the fuel tank would work with the mechanical fuel pump trying to draw fuel through it. It may work but without replacing the electric fuel pump with a pass on through tube I couldn’t say if this will work. It may but I’m not sure. Hope this helps.

[@zackthomason6105]

When you hooked up the purple and white wire to the tach port did you still have a functional tach?

[@tlariscy]

Hi this truck did not have a tach, so I’m not sure on this.

[@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

[@81071benson]

So what if you want to run a tach ,where do you hook it being you used its location for fuel pump?

[@tlariscy]

The same location.

[@brandonvansel3716]

White wire in the coil plug runs to tach side of hei and also tap into the serial data wire at the cam sensor

[@Chanchito510]

Hows the Fuel Economy?

[@chadjohnson6941]

So can I still hook my tach to the port, just splice in!?

[@tlariscy]

Yes

[@dougbonardi803]

Does changing from injection to carb affect the spark plugs performance? Seems to me a hotter plug may be necessary? Anyone have thoughts?

[@thedobermangang3503]

good video my brother

[@tlariscy]

Thanks

[@keithlove85]

I did this conversion with a 1990 7.4 l k3500. My truck got no spark with a regular hei distributer, so I switched back to the stock distributor with the coil. Now I get spark but the fuel pump is not turning or staying on. So it will slowly sputter a couple times then die. How can I energize the fuel pump?

[@tlariscy]

Hi Keith, first make sure that you had the larger red wire from the distributor harness hooked to the (+ or POS) on the HEI . This is to power your HEI. Then the purple wire with white stripe from the same harness will hook to the TACH port on the HEI, this will send the engine speed signal to the fuel pump to run accordingly. Hope this helps.

[@keithlove85]

Yes I hooked the purple with white stripe to the tach port and no spark at all. The original type distributer has worked the best. I'm purchasing an electric pump before I pull all my hair out...wait I'm bald already LOL!

[@keithlove85]

Also this will give me the ability to easily add a tach to the white wire off of the coil

[@jeffnunley1861]

What is the part number for the flueI pressure regulator

[@juansantiago8968]

I need a part # on the holley fuel pump regulator

[@keepitkush5208]

I'm doing a 454 swap on my 83 c10. The 454 has tbi buy I'm buying a new harness and going back to carb. Do I still need the tbi harness or can I use a universal harness from painless performance that does not support tbi?

[@untearly8212]

What about the tach wire and the booster hose

[@tlariscy]

Booster hose connects to valve cover just like stock configuration , tach wire connects to tach connection on HEI distributor

[@jonathanlawson4667]

I know this is a older video but dam brother get those rubber fuel lines off that truck and buy you some braided lines those rubber lines are a fire waiting to happen

[@mr_brooks_2]

Hi, Thanks for the video!!! Did you or do you have to run a throttle position sensor or does the transmission lock up still work without it. I have a 700R4 in my 89 caprice and I’ve been wanting to do this conversion for the last four years but was just a little scared

[@tlariscy]

Hi the easy way to do this is to put a manual switch to activate the lock up from the dash of your vehicle. here is a link that explains it, itstillruns.com/wire-switch-lock-up-torque-converter-700r-transmission-11372151.html hope this helps

[@carloshendrix5685]

@@tlariscy do you leave the hole on driver side valve cover open? I also have the same motor in my 86 GMC Sierra 1500 along with the Holley 600 carb and was wondering what lines you have connected to the carb

[@tlariscy]

Carlos Hendrix I used a threaded pipe Niple in rubber groumet on valve cover and attached rubber hose to vacuum source.

[@sydnibowling948]

What is the transmission lock up and do you have to do this?

[@caleb5850]

@mr_brooks_2 i have a 89 caprice switched from tbi to carb and i have some questions if you don’t mind

[@bulldogsofeastvan5647]

Thank you!

[@williammccoy6050]

so what adapters and hard lines do I need to connect the existing fuel lines? i have a 305 5.0 firebird TBI that I want to convert to carb I have the intake, carb and hei already

[@tlariscy]

Hi, I just cut the ends off of the metal lines and used rubber fuel lines with hose clamps. The pressure is not that high because of the bypass in the regulator. It sends all fuel in excess of the 6-8 psi back to the fuel tank.

[@williammccoy6050]

@@tlariscy so where sould I connect the power for an electric choke? and what about power for the HEI, and factory tach, where do I connect the wiring for distributor and factory tach? Only asking becuase there seems to be 100 different answers and I don't know which is the safest, and best way?

[@tlariscy]

@William McCoy Great questions, the power for electric choke can be any 12 v source that is switched from ignition switch. I spliced mine into the power wire for the distributor. The power wire should be in the harness that connected to the original distributor. As far as factory tach, you may have to look at some schematics for your vehicle as mine did not have a factory tach in the instrument cluster. But my guess is that the wire should be in the factory harness that connected to the distributor as the engine did not have any other engine speed sensors. So the ECM must get engine speed from the distributor. Hope this helps.

[@tlariscy]

@ William McCoy, another thought is that the tach signal is derived from the wire I recommended to connect to the tach port on HEI distributor. I’m almost certain that it sends signal to ECM and then the ECM controls the fuel pump from there, the ECM may then send the tach signal to instrument panel. Not for sure but just a hunch.

[@jonhsmith2706]

Wouldn't you need a fuel regulator because with the pump coming on wouldn't that be too much fuel for carb

[@tlariscy]

Hi John, if you watched the entire video I addressed the issue of fuel delivery, yes you need a fuel regulator.

[@jonhsmith2706]

@@tlariscyYou're right I didn't thanks for the info

[@Steelo2002]

I have a tbi 350 that was carb swapped how much fuel pressure does the regulater need to be set at its a 600 electric choke edelbrock carb

[@tlariscy]

Between 4 to 6 psi should be fine

[@Steelo2002]

Walt Lariscy thank you for your help man muchly appreciated

[@jorgehernandez-pk3mq]

Hello Mr. Lariscy. I have to ask you another question. I will be sending quite far from the US the parts that I will order for my conversion so I need to make sure that what I buy is what I need. In the case of the Intake manifold the edelbrock 2104 is the one that goes well with the cast iron heads on my 1988 350 5.7 L engine? Thank you again.

[@tlariscy]

The four center holes on intake are straight up and down on the TBI heads that’s the only difference as far as I know. Not sure if your heads have the older style center holes that are the same angle as the others.

[@kurtpitre544]

Where did you set the timing ?

[@turbodave6709]

Im going to do the conversion on my 92 camaro i allready have the hei distributer hiw and what wire would i use to run the pump thank u

[@alnov91]

Hi. Im also doing a 91 camaro 3.1 to 2.8 mani/carb swap. Did you find a distributor? What part#

[@mr.cutlass87delgadillo.d45]

Okay I have a few questions I hope 🤞 maybe you can help out

[@jamesavery6735]

So I can't do this to dd I'm having problems with it not starting I'm over it its k2500 has 4l80e

[@jamesavery6735]

Been having issues for awhile now

[@justintucker9961]

will the purple wire be the same hook up procedure with a 97 454 vortec I will be using a hei distributor also

[@tlariscy]

Hi Justin, I couldn’t say for sure without looking at one. However in theory they should be very similar though. Wouldn’t hurt to do a little research first.

[@thinkforyourself6418]

what if you use A mechanical fuel pump? And take out the electric pump in the tank

[@tlariscy]

Hi Cohen, I thought about that, seemed like too much trouble. I suppose it could be done. You would have to find a pick up and sending unit that would fit your gas tank to replace the electric fuel pump.

[@renzocustoms5072]

So the purple wire connect to the battery part on hei distributor, and the whistle wire connect to the tac part on hei distributor??

[@tlariscy]

Large red wire to pos port on hei, purple and white wire to tach port

[@dillongarcia1889]

Was yours an automatic transmission? I have a 4 speed manual and mine and was wondering if anyone knows what kind of linkage I need for it? I haven’t put it together yet but it will be on an Edelbrock AVS2 carb

[@christianhoward809]

Can you use any carb on that intake

[@zackpalmer6474]

@waltlaricy i have a 1993 k1500 with the 700r4 Thats electric could i Carburete my 350 but keep the computer just to run the trans? Like just pull all the tbi stuff off and keep the computer connected to the transmission would that work

[@tlariscy]

The only thing controlled by eco is the torque converter lock up on 700 r4. To control torque converter lock up you will have to either install a separate aftermarket controller or just wire a switch that you can manually actuate from toe cab when you want the lock up to engage. This is a work around. Personally I would install a TH350 transmission and be rid of all computer components. Hope this helps you in your search for info.

[@zackpalmer6474]

@@tlariscy sorry this may be a crazy question but what happens when the torque converter locks up on these year model trucks

[@tlariscy]

@@zackpalmer6474 older torque converters have an amount of slip, lock up torque converters fully engage the engine 1:1 like a clutch on a manual transmission but unlock when there is no demand for power. This increases gas mileage and keeps the transmission from stopping the engine by releasing and slipping. You can run without the lock up feature but will have decreased fuel mileage at highway speeds.

[@zackpalmer6474]

@@tlariscy okie dokie thx man running it without that feature would it hurt the trans?

[@zackpalmer6474]

@@tlariscy and do you have a video on how to run it without this feature