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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 08-02-2007, 01:54 AM   #1
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From what I can point out, it sounds like my fuel pump is getting weak. There is a real loud buzzing noise comeing from the rear of the car. When I turn the key it starts to buzz and turns off, then when I start it it begans to buzz again. Will a weak fuel pump contribute to poor fuel mileage? What is the avarge cost for a fuel pump in the bonne'*? Are they a pain to change?
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Old 08-02-2007, 02:29 AM   #2
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Have you actually checked the fuel pressure at the rail? With a pressure gauge?

Granted, they do tend to get loud as they get weaker, but I say it would be wise to actually check the pressure before spending the time/money replacing the pump that you may or may not actually need to replace.

My $.02, keep the change.
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Old 08-02-2007, 08:51 AM   #3
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As LH mentions.. it is recommended to check the pressure before replacing. Standard pumps seem to cost around $100-120 in my area. A failing fuel pump isn't normally viewed as contributing to excessive fuel consumption, if anything it may run you lean.

GM pumps are known to be noisy, and I've experienced a serious increase in noise before the drove me to change out the pump. Never failed..pressure checked out.. sheer noise level was too much to handle.

On the fuel consumption.. you may want to consider when you did your last tune up and how many miles are on your O2 sensor.
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