How to Reassemble a Quadrajet Carburetor

[@Avenged188]

Got that sliver taking all my focus away.. either way I wanted to thank you I have never ever ever worked on anything under the hood of ANY vehicle EVER. but have owned a 76 for about a month now and learned alot and you sir just got me to successfully taredown my quadrajet I thank you so much! Now for the 1 to 2 day bath!

[@76vette]

Hi Matt, So glad to hear my videos have proven helpful to you. Quadrajet carburetors are amazing and work very well when tuned properly, so take your time, make sure all passages and tubes are super clean, replace whatever is necessary, and your Vette will run great, and you may even see some fuel economy as a bonus. If you have any questions, feel free to reach out and I'll try to answer what I can: [e-mail] All the best! 🙂👍

[@wasd782]

Followed this video while rebuilding mine. Worked perfectly. I even used your guide on your website while disassembling it 😁 Thanks a ton!

[@76vette]

So glad to hear the video and guide were helpful. Thank you for watching! 😊👍🏻

[@aboutmyfathersbusiness8324]

I went aftermarket fuel injection and never looked back. Got tired of that float sticking open and flooding. Good meticulous information.

[@76vette]

Thank you. I've thought about going with fuel injection, and if I ever go down that road I'll make sure the fuel injection system comes attached to a C7 or C8 Corvette. lol.

[@aboutmyfathersbusiness8324]

@@76vette aha that is probably your best bet.

[@ChristelloNervio]

Awesome Vid!! Thanks!!!!!!!

[@76vette]

Thank you for watching! 😊👍🏻

[@musclecarmitch908]

Awesome carburetor rebuild videos you have made! your videos will be great to go back to for reference when I rebuild one in the future!👍

[@76vette]

Very kind. Thank you! 😊👍🏻

[@sonnystovall5836]

I have an original quadrajet in my 1980 L48.. Is this the same carb as in your videos? These are the best step by step videos I've ever seen 👍 especially for a carb novice like myself... Much appreciated sir.

[@76vette]

Hi Sonny, and thank you for the kind words. Glad to hear the videos have proven helpful. 1980 Qjets were basically identical but they added the Computer Command Control on a lot of vehicles for better main metering. The secondaries, however, were the same. So if yours has an E4M carb, then it would have an oxygen sensor in the exhaust system plus the electronic throttle position sensor which eliminated the need for a vacuum power piston and the Adjustable Part Throttle APT system. I’ve never rebuilt one of them but I think the guys at quadrajetpower.com/ have one or two videos on those. Best of luck!

[@sonnystovall5836]

@@76vette Thank you very much... God bless and I'll keep watching

[@vineent5839]

Great video very helpful thank you

[@76vette]

Glad you found it helpful. And Thank You for watching! 😊👍🏻

[@GJJC13]

Great video. What improvements did you notice after the rebuild?

[@76vette]

Easier starting and steady idle. 😊👍🏻

[@jorgeadolfotrejogarcia2235]

Friend, what is the screw on the side of the needle plunger for? It is the screw with a different head than all of them.

[@76vette]

I think you’re talking about the power pump check ball screw. Go to m.kzbin.info/www/bejne/Z5SxZ316g7R4jdk and fast fwd to 1:30 to make sure we’re talking about the same one. Hope this helps. 😊👍🏻

[@jorgeadolfotrejogarcia2235]

That no friend, a screw that has a spring that goes in the middle 0:01 next to the needle plunger, it has a strange head, the thing is that also when you adjust the carburetion, if you loosen it, that screw has more passage of gasoline, something like that friend

[@jorgeadolfotrejogarcia2235]

It is in the middle of the float needle seat and the needle plunger, there it is placed

[@76vette]

@@jorgeadolfotrejogarcia2235 Ok, that’s the Adjustable Part Throttle and for more info check out this video: kzbin.info/www/bejne/jKLbiXmtoLloa8k

[@islandlifecabinbuild2]

How come you didnt place the metal hanger onto the needle that goes at the end of the float? Looks like you want the needle to stay in the brass sleeve. Is that so the gas doesnt go back out of the carb when sitting for a few weeks

[@76vette]

cliffshighperformance.com/simplemachinesforum/index.php?topic=963.0

[@jessicaparker8912]

I came for the primary metering rods assembling and He skipped over that . : )

[@76vette]

Sorry about that. Maybe this one will help? kzbin.info/www/bejne/oWK3i4VveruLe5Y

[@76vette]

Also fast forward to 16:09 on this video kzbin.info/www/bejne/Z5SxZ316g7R4jdk I hope that helps 😊👍🏻

[@inell6]

I just did a rebuild on my Rochester Quadrajet and I thought everything was perfect. Car starts but after 15 seconds it stalls (same results after three tries). It's getting gas, spark, compression. What's your thoughts?

[@76vette]

Impossible to tell without looking at it, but it sounds like fuel starvation. Is the fuel filter installed correctly? How about the gaskets? Does it keep running if you give it gas? Have a pro look at it to determine exactly what’s causing the issue. Good luck! 😊👍🏻

[@76vette]

@@inell6 The little valve in the fuel filter is to help keep fuel in the carb. The needle clip is really unnecessary (I install it sometimes, and sometimes I’ve left it out) fuel pressure will force fuel past the needle and into the bowl.

[@76vette]

@@inell6 Oftentimes, it’s an elimination process. Good luck! 😊👍🏻

[@JONNYHOTROD]

What was the little cover you made???….was it an EGR blank off?…….and if so does it run fine without the EGR?

[@76vette]

Yes! I made it out of s small piece of flat aluminum stock, polished it, and installed it. And yes, no running issues at all. Plus one of the previous owners had already removed the smog pump.

[@JONNYHOTROD]

Thankyou for that….i live in England and own a 1983 c10 silverado 305 …i bought a blanking fitted it and took it out for a run…under secondary load the truck started stumbling and running awful so thought maybe it doesnt like it do i put the egr back on ran ok for a day then started doing the same thing again so it must have been coincidental….fuel flow problem i think do i ordered a QJ kit from the USA to freshen it up and also a new dizzy cap rotor module and plug leads….hopefully this should solve my problem! The truck was totally de smogged before it was shipped to England!

[@76vette]

Also, check the timing. 😊👍🏻

[@JONNYHOTROD]

@@76vette why would the timing alter all of a sudden???

[@76vette]

I’m not saying it did. But it’s always a good idea to check.

[@jasonbeason4780]

The plastic cup is it necessary to have or not. Is there a pro or con for using or not using the black cup 🤔.

[@76vette]

It really doesn’t make any difference.

[@jasonbeason4780]

So just more fuel in the bowl. So that's more WOT and no worries about emptying the bowl.

[@jasonbeason4780]

@@76vette my problem is when I'm at part throttle my car sounds like it has a monster cam in it. But at idle does great at WOT does great just when pulling in 1st gear in my driveway whop whop whop like a helicopter Chopin trees looking for trees lol 😆. Never had a quad do this before. Never ever. At screw maybe. It doesn't smoke nothing just sounds like it's cammed to death. I have it turned from seat out 3 turns. Idk 🤷‍♂️ I'm stumped

[@76vette]

@@jasonbeason4780 When you say you have it set at 3 turns out are you talking about the APT system? I’m assuming your carb has one since you mentioned the “black cup.”

[@jasonbeason4780]

@@76vette yep the part throttle is 3 turns out. Starts the ruff idle when pulling the driveway at a higher rpm. I have a 288 480 cam In a 350 with flat top pistons and factory 882 heads. 2200 stall for a 700r4. I have the plug for the apt knocked out tapped and a treaded plug in there. Carburetor has had a modification kit I installed from quadrajet power. They put this kit after I told them my engine built sheet specs. Just when I get to around the stall converter lock up rpm is when the car acts like its missing. Car doesn't jerk or nothing it just doesn't make since. The blop blop like a huge cam is in it. At lidle sounds great. But this cam says it starts power ant 2 to 5 thousand rpm. I really don't know. Waiting on a part idle wrench so maybe it needs a fine tune. If I got to shut the chocked butterfly it starts flooding. That's the only time it smokes. Starts up very snappy. Like no hesitation on the fire up.

[@TheDrunksInATree]

what happens if you forgot to throw in the plastic thing at 5:51 ?

[@76vette]

Good question, and the simple answer is… nothing happens. It makes no difference whatsoever. 😊👍🏻

[@TheDrunksInATree]

@@76vette okay good thank you! unfortunately my quadrajet is leaking it seems through a screw, whenever we tighten it the leak goes away its weird,

[@76vette]

Very strange because AFAIK, none of carburetor screws go into areas where gasoline passes through, so it’s impossible for them to wick gas out. My guess is that it is leaking from somewhere else and most likely the result of a warped air horn. Good luck. I hope you can get it repaired properly. 😊👍🏻

[@ryangonzalez7013]

My carburetor choke plate stays open and won’t return to its position what can I do

[@76vette]

Is the choke rod properly connected? If it is, is the choke set correctly?

[@ryangonzalez7013]

Yes

[@76vette]

Without looking at the carb in person, it’s impossible to tell. Have someone qualified look at it.