2000 GMC Sonoma Fuel Pump Whine

GMC SONOMA
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2000ZR2
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  • 2 POSTS
My 2000 GMC Sonoma's fuel pump has been whining really loud for about six months now. I haven't noticed any change in the performance of the vehicle but I was wondering if this sound means that the pump is going bad. It makes the same noise the whole time that the truck is one. How much is it to get a new pump put on by a mechanic and how hard would it be for a person like me who has only done minor work to brakes and little things like that to get the job done. Thanks.
Mar 29, 2006 at 8:49 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
Fuel pump whine is a common occurance in the 99-01 GM trucks. I wouldn't worry about it as it is a faulty plastic bearing in the pump. If it gets too bad and you can't hear the radio have it replaced.

It is a major job as the tank has to be dropped. NOT for a home mechanic. I expect it will cost about $300+ Good Luck!
Mar 29, 2006 at 8:57 AM
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Suggested Repair

The whine is common on 1999-2001 GM trucks and is attributed to a faulty plastic bearing in the fuel pump. Replacement is not needed unless the noise becomes excessive. If replaced, the fuel tank must be dropped; this is a major job not recommended for a home mechanic with only minor experience. Expect about $300 or more at a shop.

Conversation Summary

The owner of a 2000 GMC Sonoma reported a loud fuel pump whine for about six months with no change in performance and asked whether the pump was failing, what replacement would cost, and whether a novice could do the job. The expert said this whine is common on 1999-2001 GM trucks because of a faulty plastic bearing, so it is not a concern unless the noise becomes too loud to hear the radio. Replacement requires dropping the tank, is not suitable for a home mechanic, and was estimated at about $300 or more.

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