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.

Fuel Pressure issue

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Old 04-09-2006, 06:43 PM
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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.
Old 04-09-2006, 07:44 PM
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That'* typical for 92'* because of the shorter strainer and lack of baffles in the tank.
http://www.bonnevilleclub.com/forum/...664&highlight=
Old 04-09-2006, 11:49 PM
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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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