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Quadrajet Carb Talk and Tips / Re: Marine Quadrajet, e-10 fuel, stored 5m a year, how often should I clean/rebuild?
« Last post by LouC on October 24, 2025, 11:15:15 AM »
OK since I got an outboard tank for testing and put a shut off in the fuel tank hose, what I am going to do is run it for a while on the fuel in the tank (E-0 94 Octane) and shut it off with the shut off valve, then hook up the regular fuel line. Should be about the best I can do....
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Quadrajet Carb Talk and Tips / For those with Marine Quadrajets, a good troubleshooting tip....
« Last post by LouC on October 24, 2025, 11:09:06 AM »
Fuel supply problems are common in marine applications, due to the design of boat fuel tanks. So before you pull your Quadrajet apart, due to a low WOT RPM issue, try running it on an outboard tank first. This takes the boat fuel system out of the running for what's causing the problem. If the boat runs as it should then, it's not your carb or fuel pump or even other causes like your ignition system. It will be either the anti siphon valve on the tank, the pick up tube in the tank or the vent. If you to decide to test this way just be careful with the routing of the fuel line and I'd advise fitting a shut off valve just in case....
I had this problem all season, cleaned and rebuilt the Q-Jet, went through the whole ignition system, and finally did the separate outboard test, and it was not the carb, fuel pump or ignition, it is the boat's fuel system! Should have done that FIRST!
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Diagnose a Quadrajet carburetor problem / Re: 1979 Firebird Trans Am aka the turdbird has problems
« Last post by Kenth on October 24, 2025, 11:05:59 AM »
Quote from: Ponchonutty on October 24, 2025, 06:53:07 AM
This is a horrible picture I took from a video he sent me with him running it on his test engine.  This was WOT and this is the widest the secondaries go.  I was told he pulled a lot of performance out of the carb due to being for a Pontiac 301?

The air valves will NOT open fully unless you put load on engine driving the car.
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Diagnose a Quadrajet carburetor problem / Re: 1979 Firebird Trans Am aka the turdbird has problems
« Last post by Ponchonutty on October 24, 2025, 10:55:05 AM »
Quote from: 77cruiser on October 24, 2025, 10:44:59 AM
He got you good, wow. That puller pic is the air bleed the larger tube is the pullover.
I don't know about 301's but the sec. should open farther than that.

Yeah, After I bought Cliff's book and went back through the archives of my messages with him, I realize what I was failing to see now.
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Diagnose a Quadrajet carburetor problem / Re: 1979 Firebird Trans Am aka the turdbird has problems
« Last post by 77cruiser on October 24, 2025, 10:44:59 AM »
He got you good, wow. That puller pic is the air bleed the larger tube is the pullover.
I don't know about 301's but the sec. should open farther than that.
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Quadrajet Carb Talk and Tips / Re: 7043202 quadrajet by Carter. Missing rod?
« Last post by hansi on October 24, 2025, 07:45:55 AM »
Quote from: Kenth on October 21, 2025, 11:57:53 PM
This may help some:

Thanks a BUNCH!!
Anybody got that choke pulloff rod??
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Diagnose a Quadrajet carburetor problem / Re: 1979 Firebird Trans Am aka the turdbird has problems
« Last post by Ponchonutty on October 24, 2025, 06:53:07 AM »
This is a horrible picture I took from a video he sent me with him running it on his test engine.  This was WOT and this is the widest the secondaries go.  I was told he pulled a lot of performance out of the carb due to being for a Pontiac 301?
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Diagnose a Quadrajet carburetor problem / Re: 1979 Firebird Trans Am aka the turdbird has problems
« Last post by Ponchonutty on October 24, 2025, 06:50:25 AM »
What I found in the first rebuild which prompted me to replace everything.
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Diagnose a Quadrajet carburetor problem / Re: 1979 Firebird Trans Am aka the turdbird has problems
« Last post by Ponchonutty on October 24, 2025, 06:49:40 AM »
Filter as shown last year allegedly from fuel contamination on an entirely new fuel system.
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Diagnose a Quadrajet carburetor problem / Re: 1979 Firebird Trans Am aka the turdbird has problems
« Last post by Ponchonutty on October 24, 2025, 06:48:37 AM »
Plugged POE
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