Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Fuel Pressure
Cliff Ruggles:
That's not going to work. The pressure should be steady, and not past about 7psi at any time. Some late model pumps were high pressure, but most were low pressure. I think in later years they were trying to move more fuel thru the return system to keep it cooler as those emission controlled engines had some pretty hot underhood temperatures......Cliff
von:
Well I replaced the pump with a new parts store replacement. Now the pressure is about 1 psi higher. Pulsates wildly between about 4 and 13 psi. When shut off it stays at 9.5. I give up.
1985C10:
I'd would confirm this with another fuel pressure gauge.
73ss:
A plugged return line will cause this. Do you have one? Is it plugged? This happened to me once. Pressure would go above 9.
von:
The car doesn't have a return line. Factory fuel line.
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