Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Difficult hot/wam restarts...Ethanol?
Cliff Ruggles:
Just curious as to where you have the timing set at, and if the vacuum advance is hooked up to ported or manifold vacuum?
Does the engine require a shot of fuel from the accl pump on hot restarts, or just it just take several seconds to start instead of roaring to life at the turn of the key?.....Cliff
brown7373:
8 degrees btdc, ported vacuum advance. I have never given a shot of gas before, but the funny thing is, today I decided to try that. It made it worse. The engine feels like it is flooded, but the bowl is never out of fuel, and it doesn't appear low.
Cliff Ruggles:
Do you see any vapor coming up out of the carb after a hot shut-down. Sounds like it is leaking some fuel into the intake after shut-down causing a rich condition for hot restarts.....Cliff
brown7373:
I have nor specifically checked for that, but will today. It has baffled me, because the cold start is immediate, and shows no sign that the bowl was low on fuel. That applies if it is restarted after a few hours or a few weeks. If it had a small leak when shut down hot (normal operating temperature), wouldn't it continue to leak over night or during a week or two of sitting?
Cliff Ruggles:
I've seen a few set-ups have a pressure rise on hot shut-downs and push enough fuel past the N/S assembly to overflow a little fuel into the engine making restarts difficult, and the engine act slightly flooded. This would happen with a mechanical pump set-up, and is easy to test, just loosen the fuel line right after a hot shutdown and see if it helps the problem.....Cliff
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