1998 GMC Jimmy Fuel Pump Failure

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MISSTIX3
  • MEMBER
  • 1 POST
1998 GMC Jimmy with 130,000 miles

How do you know the fuel pump has gone out? What type of sound does it make?
May 4, 2006 at 10:28 AM
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SYNCRAIT
  • ✓Experienced Mechanic
  • 235 POSTS
well if your fuel pump is bad it wont make any noise.... usually when you turn your ignition on you will hear like a whirring noise if its working correctly it will be coming from in or near your fuel tank. To see if it is the fuel pump take a rubber mallet and strike your fuel tank in the middle firmly; not as to puncture it ; while someone else trys to turn the engine over if this is the case replace it as soon as possible you dont want to do this more than a few times. hope that helps
May 4, 2006 at 1:17 PM

Suggested Repair

A working fuel pump usually makes a brief whirring sound from in or near the tank when the ignition is turned on; a failed pump is typically silent. As a check, have someone crank the engine while you firmly tap the middle of the tank with a rubber mallet without puncturing it. If that restores operation, replace the pump promptly and do not repeat the tap more than a few times.

Conversation Summary

The owner of a 1998 GMC Jimmy with 130,000 miles asked how to tell if the fuel pump has failed and what sound it makes. The expert said a bad pump usually makes no noise, while a working pump whirrs near the tank at key-on. They suggested tapping the tank with a rubber mallet while cranking and replacing the pump soon if that gets it running.

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