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Fuel Pressure

Forum: C3 HVAC, Fuel, Emissions, and Exhaust

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Fuel Pressure

Posted: 8/8/09 5:24pmMessage 1 of 6
D
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Medford, NY - USA
Joined: 2/24/2007
Posts: 40
Vette(s): 1972 Convertible; Targa Blue. Factory A/C. 1971 LT-1 Motor; Dart Pro I heads; Comp Cam; Roller Rockers; Holley 770 Carb; MSD Igniton; Hooker Headers/Side Pipes; Tilt/Tele; PS; L-88 Hood.
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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Fuel Pressure

Posted: 8/8/09 6:55pmMessage 2 of 6
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Oklahoma City, OK - USA
Joined: 4/1/2007
Posts: 432
Vette(s): 1972 LS5 Convertible,Auto.Targa Blue with Black Interior.
All 1970 and later should be 7 1/2 to 9 psi according to my shop manual. 
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Fuel Pressure

Posted: 8/8/09 7:41pmMessage 3 of 6
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Medford, NY - USA
Joined: 2/24/2007
Posts: 40
Vette(s): 1972 Convertible; Targa Blue. Factory A/C. 1971 LT-1 Motor; Dart Pro I heads; Comp Cam; Roller Rockers; Holley 770 Carb; MSD Igniton; Hooker Headers/Side Pipes; Tilt/Tele; PS; L-88 Hood.
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. 
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Fuel Pressure

Posted: 8/9/09 6:43amMessage 4 of 6
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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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Fuel Pressure

Posted: 8/9/09 9:25amMessage 5 of 6
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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. 

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Fuel Pressure

Posted: 8/9/09 12:56pmMessage 6 of 6
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Medford, NY - USA
Joined: 2/24/2007
Posts: 40
Vette(s): 1972 Convertible; Targa Blue. Factory A/C. 1971 LT-1 Motor; Dart Pro I heads; Comp Cam; Roller Rockers; Holley 770 Carb; MSD Igniton; Hooker Headers/Side Pipes; Tilt/Tele; PS; L-88 Hood.
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.
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