Topic: Fuel Pressure
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
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Hi all,
What should the fuel pressure be for a stock fuel pump at idle? This is on a 1972 350 SB.
Thanks.
Rob
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Thanks, appreciate the reply. My fuel pressure at idle is bouncing back and forth from 3 to about 9. I'm hoping this is what is causing my problems.

HOWELL, NJ - USA
Joined: 5/18/2004
Posts: 6812
Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
Bouncing from 3-9# seems kind of erratic. Maybe the gauge or the location it's tapped in at.
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A gauge bouncing that much would indicate either a weird gauge, or a faulty check-valve in the fuel pump.
It could also be because of a float/needle/seat issue that allows the float to be bounced off the seat each time the pump stokes, which would cause a flooding issue, but, you didn't say what the actual problem is.
It could also be because of a float/needle/seat issue that allows the float to be bounced off the seat each time the pump stokes, which would cause a flooding issue, but, you didn't say what the actual problem is.
Every day I learn I know less than I thought I did.
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The gauge is a new holley along with a new holley 770 carb; but I had the same problem with the old carb which was a Edel. The gauge is tapped right into the fuel line that is attached to the carb. The motor acts like its missing when you tap the gas; but when I'm on the road and step into it she gets up and goes. I need to have someone sit in the car and take reading at different rpm to see what the pressure does. Maybe I should just change it and be done with it.
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
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