Fuel Pressure issue - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-09-2006, 07:43 PM   #1
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Default Fuel Pressure issue

Having trouble with stumbling in right hand turns and slow starts. She has been alittle flat at WOT too. Checked my fuel pressure today. 0 psi at ignition only. Would go to 38 psi when started, about 41 psi on revved unloaded engine. then drop instantly back to 0 when ignition is off. Maybe a bad check valve in tank? I checked FPR, it did not leak gas but smelled a little of gas (Vacuum line). I also looked at the Maxi fuse center and I seem to be missing a relay ( I think) It would be the far right one on passenger side. Maybe it was never there but the car has every option. Your comments, suggestions or solutions would be greatly appreciated.
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Old 04-09-2006, 08:44 PM   #2
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That'* typical for 92'* because of the shorter strainer and lack of baffles in the tank.
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Old 04-10-2006, 12:49 AM   #3
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You should be holding fuel pressure for a while after turning off the key. I got sprayed last time I removed my fuel rail, an hour after shutting off the car. Your pressure is a tiny low when running, but ok. So my opinion is that the valve in the pump isn't preventing back flow.
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