Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Fuel pooling under secondary hanger - normal?

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Cliff Ruggles:
Correct, many of the later model fuel pumps had higher pressure.  I'm guessing this was done to circulate more fuel thru the return to keep it cooler, as underhood temps on later model emission vehicles was significant.

I've had customers report fuel pressure as high as 10-12 psi with some applications.  Usually they were having issues, and checked it as part of the troubleshooting.

The later carburetors are fine with higher pressure, 7-8 psi will not bother them in the least.  I run 7.5 psi on my 1977 Pontiac carburetor with a regulator and 140gph pump.  I do have a bypass back to the tank, to keep things happy and take some load off the pump.

http://www.youtube.com/watch?v=6zVdoLR-VzM&feature=plcp

......Cliff

Shark Racer:
Thanks everyone. I lowered the float level and the flooding is gone.

I had some nozzle drip and fattened up the mixture, the nozzle drip is now gone.

I still have a binding primary shaft (forgot to sandpaper the shaft, so I'm going to take it out and do that and stop by my friend's machine shop in case it's just a bit more than that). Same problem as another poster on here - the thing returns fine with the motor off but sticks with it running. The primary shaft doesn't rotate smoothly in the bore (even without throttle plates) so I'm going to try to fix that first.

Cliff, I'll be sending you an email in a few minutes so we can cook up another order.

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