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09-17-2006, 12:34 PM
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#1 |
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Registered User
Join Date: Dec 2005
Location: Benton, IL
Posts: 95
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Quadrajet carburetor problems!
My '85 has a quadrajet and if it sit more than a day it has to crank a long time before it wil start. I have always had Holleys or Eldelbrock carbs and if you pumped it one time, it would fire as soon as the thing turned over. If you pump this quad., it acts like there ain't a bit of gas in the carb. I know a lot about holleys, but this one I am in the dark. You can pump the crap out of it and it acts as if there is no gas in the carb. Do these things have a check valve in them that allows the gas to siphon back out if it is bad or something? I know there is a quadrajet nut out there that has the answer to this question. Thanks for the help in advance.
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09-17-2006, 01:36 PM
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#2 |
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Registered User
Join Date: Oct 2004
Location: Roma,TX
Posts: 774
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Re: Quadrajet carburetor problems!
Well, I don't know why they do this, but I have the same exact problem.
TTT. Hopefully somebody here has an answer.
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1978 stepside C10 build: http://67-72chevytrucks.com/vboard/s...d.php?t=468265 |
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09-17-2006, 04:24 PM
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#3 |
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yeeha
Join Date: Sep 2005
Location: Sherwood Park & Fort McMurray, Alberta
Posts: 72
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Re: Quadrajet carburetor problems!
I seemed to have fixed the problem on my quadrajet by changing the fuel filter to one that has a check valve built right in to it (you will see a plastic ball floating around inside the paper element). It starts good day to day but if I wait a week to start it I have trouble.
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1969 GMC 910 97% rust free 2002 olds Alero 1986 New Yorker 4dr ... the new DD...My POS car... dude its got a turbo!!! Don't drink and drive, you might spill something!!! Daryl Kuchmak |
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09-17-2006, 07:01 PM
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#4 |
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Senior Member
 Join Date: Dec 2003
Location: Valparaiso, In
Posts: 1,114
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Re: Quadrajet carburetor problems!
I have the same problem with mine. I am guessing there is a float or needle valve that is sticking or not seating good that lets the gas leak back causing the hard starting. It seems like, once I get it started, I can shut it off and start it many times with no problem, but let it sit overnite, and I have to pump like heck to get it started again.
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Phuloi68 Indy survivor Norwood survivor Big Sandy survivor for those who fight for it... F R E E D O M has a price the protected will never know.  |
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09-17-2006, 07:17 PM
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#5 |
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Insert Witty Text Here
Join Date: Oct 2002
Location: San Antonio, TX
Posts: 3,415
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Re: Quadrajet carburetor problems!
When the rebuilders do a quadrajet, there are some spots in the bottom that they seal with JB Weld to stop them from leaking. Maybe you guys need to do that?
Slonaker |
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09-18-2006, 08:24 PM
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#6 |
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Registered User
Join Date: Feb 2002
Location: Vacaville, CA
Posts: 2,746
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Re: Quadrajet carburetor problems!
^ Yup, fuel bowl plugs leaking.
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 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI |
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09-18-2006, 08:34 PM
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#7 |
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Registered User
Join Date: Oct 2003
Location: Maryville, TN
Posts: 477
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Re: Quadrajet carburetor problems!
I went through 2 quadrajets trying to get it right. I finally went to Auto ZOne and bought a 500 cfm Eldabrock...........I must have doubled my gas mileage.
good luck |
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09-18-2006, 09:35 PM
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#8 |
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Sb 400 club
Join Date: Nov 2005
Location: NH / MA
Posts: 2,745
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Re: Quadrajet carburetor problems!
yeah my old q jet got rebuilt and all that was needed was a pump and she would fire right up even after siting a week. But i sold that truck and my 84 has a 650cfm Edelbrock that i love. IF you know hollys and you can afford a used or new one go for it. BTW nice Pete man i love those trucks and i too have alot of tractor projects going.
got any pics of your 85 or 77
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1984 chevy c10, built 400sb,.(SOLD )77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363 1956 Willys Wagon (327 chevy) Project (Now Buick 225) 1980 Corvette L-48 4 speed 1992 Mustang GT built 5.0 5 speed 1985 C10 LWB Sold 1982 K10 SWB plow truck Parted out 1986 D30 M1028 fire brush truck Parted out |
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09-23-2006, 12:02 PM
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#9 |
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Registered User
Join Date: Dec 2005
Location: Benton, IL
Posts: 95
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Re: Quadrajet carburetor problems!
Here is the '85 the day I brought it home.
 Here is my '75, we have had it since 86. 
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10-03-2006, 11:25 PM
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#10 |
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Registered User
Join Date: Oct 2006
Location: iowa
Posts: 722
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Re: Quadrajet carburetor problems!
i'd start by replacing the fuel pump....usually they have a check valve in them of some sort...also look at the seep holes on the pump to see if they are wet...if they are..the pump is bad....if that doesn't cure it look over the rubber lines...if they are dryed out and cracked they will allow air in and allow the carb. to drain back...but to be honest...get rid of the Q-toilet and get an edelbrock...
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"Horsepower is how fast you hit the wall, torque is how far you carry the wall with you." '84 chevy half ton short box 2wd, 67,000 actual miles  '03 chevy 1500 HD crew cab 4x4 standard box, 6.0L 
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