Quadrajet Carburetor Rebuild - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nofords · 01-24-2008, 10:28 AM

Lawman02; I've rebuilt many Q-Jets in my lifetime of Chevy ownership, and in my experience if your carb is running rich, the culprit is the float. Some of these carbs had a brass float and some had a phenolic resin float. Both were subject to their own failures. The brass float would crack due to vibration, and the phenolic resin float would soak up gas, they both got heavy and caused the wet fuel level to be high which equals rich mixture and poor fuel economy. Rebuilding them is not rocket science, but very close attention must be paid to measurments and for sure the float level. I would be glad to help if you decide to tackle this yourself...

nofords

aventur1 · 01-24-2008, 11:09 AM

cruiserman
Good to see another member in the area!!! Just will be starting to work on mine, just got it in the fall. I love to drive it more than my Dakota!

nofords
I might just tackle the job, heard before of the floats, maybe clean it up check a few things and replace the float, I'm mech. inclined, work on air craft for 10 years so I think I can do this. I'll check on some basic rebuild kits from some where? I should be able to get them locally.

**El Jay** · 01-24-2008, 01:13 PM

Quote:

Originally Posted by cruiserman

Nah, there are replaceable primary and non-replaceable secondary jets.

Like I said, it's been a LONG time time since I messed with one.

We're literally talking DECADES.

Yeah. I'm that damn old.

xDiesel · 01-24-2008, 01:23 PM

What you need to do is buy a rebuild a kit and any other parts you need for your carb, then find a guy who knows how to do it and buy him a case of beer if he does it for you. Thats what I did and now my carb works great.

**VetteVet** · 01-24-2008, 01:28 PM

Here's a pretty good site for re-building Q-jets with pics. There's even one that show the Idle adjustment screws.

http://www.4wheelnoffroad.com/qjet.html

aventur1 · 01-24-2008, 09:10 PM

Hey a case of beer sounds good! We can drink it and rebuild the carb! Thanks for the carb rebuild site, now I have 2 sites to compare.

LawMan02 · 01-24-2008, 10:32 PM

Quote:

Originally Posted by nofords

Lawman02; I've rebuilt many Q-Jets in my lifetime of Chevy ownership, and in my experience if your carb is running rich, the culprit is the float. Some of these carbs had a brass float and some had a phenolic resin float. Both were subject to their own failures. The brass float would crack due to vibration, and the phenolic resin float would soak up gas, they both got heavy and caused the wet fuel level to be high which equals rich mixture and poor fuel economy. Rebuilding them is not rocket science, but very close attention must be paid to measurments and for sure the float level. I would be glad to help if you decide to tackle this yourself...

nofords

That's exact what it's doing...running rich. I'll give it a try if you don't mind giving advise. Or I would pay to have you rebuild it. I know it would be a learning experience for me and although I'm not a mechanic, I grew up on a farm and in the logging business. I'll read the link provided on this thread and then buy the kit. Any special kit that you reccommend or just one from NAPA? Randy

aventur1 · 01-24-2008, 10:58 PM

Here's another link about Quads. to help out.
http://www.lbfun.com/Corvette/Tech/v...ng%20Paper.pdf

**jaros44sr** · 01-25-2008, 02:50 AM

Quote:

Originally Posted by VetteVet

Here's a pretty good site for re-building Q-jets with pics. There's even one that show the Idle adjustment screws.

http://www.4wheelnoffroad.com/qjet.html

Thanks VV, great info available in there. Even figured out how to save it in my computer. Wonders will never cease

J.

Old Goat · 01-26-2008, 09:53 PM

Randy,
Get the carb number off the driver side rear of the main body, and lets see about getting a good overhaul kit, along with new float and filter, etc.
These guys have really good parts, if we can't do good at NAPA.
http://www.carburetor.ca/carbs/HTML/...s/catalog.html
We'll "get er dun",
Charles

chipflyer · 02-04-2008, 01:34 PM

Quote:

Here's another link about Quads. to help out.
http://www.lbfun.com/Corvette/Tech/v...ng%20Paper.pdf

The guy that wrote that document (Lars Grimsrud) is one of the best rebuilders in the business and is the "guru" over on the corvette forums. Just got a note back from Lars and he will rebuild and test run a carb for $160. Thats where I will be sending one. Google his name, he is well known/respected. His email address is V8fastcars@msn.com

Jeff

aventur1 · 02-04-2008, 09:10 PM

Thanks Chip
I did call a local carb shop here. Told him I'm not getting very good gas mileage, like 9.1 driving around doing the speed limit, not putting my foot into it etc. etc. Well he asked if I passed the emission test that we have here in Idaho. Yes, I passed no problem, then he said well your carb is ok. Now if I'm only going to get 9 or 10 mpg I thought to myself I might as well get a 400 HP engine and have some fun and get the same mileage. I suppose I could look into another manifold and carb also. I would bet I should be getting at least 12 to 14 at the most which would be ok, I would understand that! It's a daily driver and I really like driving it around.

01-24-2008, 10:28 AM	#26
nofords Registered User Join Date: Oct 2007 Location: Hyannis,Ne. Posts: 28	Re: Quadrajet Carburetor Rebuild Lawman02; I've rebuilt many Q-Jets in my lifetime of Chevy ownership, and in my experience if your carb is running rich, the culprit is the float. Some of these carbs had a brass float and some had a phenolic resin float. Both were subject to their own failures. The brass float would crack due to vibration, and the phenolic resin float would soak up gas, they both got heavy and caused the wet fuel level to be high which equals rich mixture and poor fuel economy. Rebuilding them is not rocket science, but very close attention must be paid to measurments and for sure the float level. I would be glad to help if you decide to tackle this yourself...nofords

01-24-2008, 11:09 AM	#27
aventur1 Registered User Join Date: Aug 2007 Location: Boise, Idaho Posts: 676	Re: Quadrajet Carburetor Rebuild cruiserman Good to see another member in the area!!! Just will be starting to work on mine, just got it in the fall. I love to drive it more than my Dakota! nofords I might just tackle the job, heard before of the floats, maybe clean it up check a few things and replace the float, I'm mech. inclined, work on air craft for 10 years so I think I can do this. I'll check on some basic rebuild kits from some where? I should be able to get them locally. Last edited by aventur1; 01-24-2008 at 11:10 AM. Reason: spelling

01-24-2008, 01:23 PM	#29
xDiesel Registered User Join Date: Jun 2006 Location: Janesville, WI Posts: 13	Re: Quadrajet Carburetor Rebuild What you need to do is buy a rebuild a kit and any other parts you need for your carb, then find a guy who knows how to do it and buy him a case of beer if he does it for you. Thats what I did and now my carb works great. __________________ __________________________________ 1969 GMC 3/4 Ton 4x4 - 350 4-Speed 2004 GMC Sierra 1500 4x4 - 5.3L Auto

01-24-2008, 01:28 PM	#30
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	Re: Quadrajet Carburetor Rebuild Here's a pretty good site for re-building Q-jets with pics. There's even one that show the Idle adjustment screws. http://www.4wheelnoffroad.com/qjet.html __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

01-24-2008, 09:10 PM	#31
aventur1 Registered User Join Date: Aug 2007 Location: Boise, Idaho Posts: 676	Re: Quadrajet Carburetor Rebuild Hey a case of beer sounds good! We can drink it and rebuild the carb! Thanks for the carb rebuild site, now I have 2 sites to compare.

01-24-2008, 10:58 PM	#33
aventur1 Registered User Join Date: Aug 2007 Location: Boise, Idaho Posts: 676	Re: Quadrajet Carburetor Rebuild Here's another link about Quads. to help out. http://www.lbfun.com/Corvette/Tech/v...ng%20Paper.pdf

01-26-2008, 09:53 PM	#35
Old Goat Registered User Join Date: Aug 2006 Location: Louisiana Posts: 18	Re: Quadrajet Carburetor Rebuild Randy, Get the carb number off the driver side rear of the main body, and lets see about getting a good overhaul kit, along with new float and filter, etc. These guys have really good parts, if we can't do good at NAPA. http://www.carburetor.ca/carbs/HTML/...s/catalog.html We'll "get er dun", Charles

02-04-2008, 09:10 PM	#37
aventur1 Registered User Join Date: Aug 2007 Location: Boise, Idaho Posts: 676	Re: Quadrajet Carburetor Rebuild Thanks Chip I did call a local carb shop here. Told him I'm not getting very good gas mileage, like 9.1 driving around doing the speed limit, not putting my foot into it etc. etc. Well he asked if I passed the emission test that we have here in Idaho. Yes, I passed no problem, then he said well your carb is ok. Now if I'm only going to get 9 or 10 mpg I thought to myself I might as well get a 400 HP engine and have some fun and get the same mileage. I suppose I could look into another manifold and carb also. I would bet I should be getting at least 12 to 14 at the most which would be ok, I would understand that! It's a daily driver and I really like driving it around.



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