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Gold Member
Send PMClifton, NJ - USA
Joined: 10/3/2003
Posts: 142
Vette(s): 1972 Coupe
Ontario Orange
Black leather interior
LS-5; Turbo 400
Do fuel pumps have a check valve on the outlet? I installed a pressure gauge between the filter and the carb. At idle, the gauge needle oscillates between 0 and about 7lbs, as the engine speed increases it seems to settle in around 6 1/2 lbs. I thought that a fuel pump with a return line would have some sort of regulation and a check valve on the outlet. When the engine is shut off, the pressure reading drops to 0 immediately. Is this normal, or is the pump history? (The pump is approx 16 years old, but has few hrs on it.)
TIA & Happy and safe 4th to all.
NJ BB Ken
TIA & Happy and safe 4th to all.
NJ BB Ken
1972 T Top 454; "Boomer" Latest "upgrades": 1 1/8" front Stabilizer bar. Rebuilt SS calipers with O-ring pistons. Under car Chambered exhaust. Fiberglass rear spring (360lbs/in). Bilstein Rear Shocks. 3/4" Rear Stabilizer Bar. Tow hitch. Performer manifold with 600 cfm Holley. Comp Cam 262 .499 lift. L-88 Hood in process
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H
I had the same problem. Bad fuel pump.
Below is a link to the thread where this was discussed.
http://www.VetteRegistry.net/vrforums/message_go.asp?MID=40142
Good luck
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Clickable link: http://www.VetteRegistry.net/vrforums/message_go.asp?MID=40142
Jim Olson 
"The Toys"...!!! Save the Wave! 
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in Forum: C3 HVAC, Fuel, Emissions, and Exhaust
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