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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 01-10-2008, 12:09 AM   #1
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Default Back to the gas tank

Ah, so a few weeks ago, I replaced my sending unit, and while I was at it, I replaced the fuel pump and the flex pressure line.

Now, the car needs to turn over for about 45 seconds before it starts.

First, a 30 second key-turn, then a 15 second one. It seems to start faster if its been running.

I suspect the new fuel pump is allowing fuel pressure to leak back into the tank, and/or the new pump can't pressurize the fuel lines fast enough. Nothing else has been changed on the car.

There are no visible leaks. The car used to start immediately.

I suspect I will be dropping the tank and putting a (second) new fuel pump in during the next few days. Luckily, its been nice and everything should still be a bit loose from the last adventure.

Any thoughts?

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Old 01-10-2008, 12:24 AM   #2
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Since it'* more than likely the pump, I might recommend driving it as little as possible until you can get that pump swapped out. If that fuel pump gives out or pumps too little fuel while running down the road, something bad could happen. I'd imagine it'* possible that you could start leaning out, and it all goes down hill from there.

Can you hear the pump trying to pressurize the fuel system if you turn the key forward, but not start it? If so, is it a uniform, constant noise or does it sound like it ranges up and down?

I'm kind of wondering if there could possibly be air in the line too. Probably pretty unlikely, but possible. Perhaps a fuel pressure test could give you a little bit better info before you drop the tank again... and tell you whether there'* air in there somewhere or not.
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1997 Bonneville SE - H4U, 3.06:1, Tinted Tails, Bridgestone Potenza G009 225/60/16s
Performance: INTENSE PCM, INTENSE 180* T-stat, Gutted air box, K&N air filter, Ported LIM, Borg Warner Wires, NGK TR-55 Plugs, Adjustable Trans Modulator, Flowmaster 80 crossflow muffler w/ quad tips.
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