Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Difficult hot/wam restarts...Ethanol?

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blazer74:
I also have had the fuel pump issue, mine was to the point of having to hold the pedal to the floor to get the engine to start.

Seems like most aftermarket pumps put out to much pressure and heat soak makes it worse. Pressure In the lines increases with heat soak causing the pressure to overcome the needle/seat and flood.

I still have a slight hot start issue but nothing like it was.

Float level to high will also cause problems.

Air tex I think is one of the worst. Some can put out up to 9 psi which is too much. I plumbed In a gauge to see what the press actually was.

brown7373:
Air-Tex "one of the worst".  Great...that seems likely to be my problem.  Oh well, fuel pumps are not really that expensive.

von:
Yep "Air-Tex" was the brand I had. I had two of them before I rigged up a pressure gauge and found 9 psi running on one and 10 psi on the other. After shutting the fully warmed engine off the pressure would rise for a few minutes before slowly dropping.

brown7373:
Air-Tex...Great, I also have one on my 70 Bonneville that I am rebuilding, so I may have the same issue when I get that back on the road.  I've owned the Bonne for 36 years.  I have always been able to just reach in and twist the key, like after a fill up, without even getting in the car.  It has always fired right up and idled fine.

blazer74:
If you have the time and desire plumb in a pressure gauge and you will see the pressure issue. Gets to the point of overcoming the needle sometimes and flooding the engine.
Some run an a/c delco  pump for this issue.

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