Fuel pump not working

Tiny
BILL SHOTWELL
  • MEMBER
  • 1996 CHEVROLET CAPRICE
  • 4.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
Fuel pump problem I think. Do not hear it running. The gas gauge shot up to show a full tank when it only has a half. Sometimes it tries to start. Checked the connection as the gas tank for volts and it shows 8.2 volts. Is that enough to run it. Is it a relay? The fuse is good.
Wednesday, June 24th, 2015 AT 12:30 PM

3 Replies

Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Quickest way to check is to go to a parts store and rent a fuel pressure gauge. Check fuel pressure when the key is turned to the "on" position not "run" and see what your readings are. If no pressure then I would replace the pump.

Here is a link to an article from this site with step by step instructions and pictures explaining the process of checking the fuel system pressure, regulator and fuel pump in less than fifteen minutes:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Wednesday, June 24th, 2015 AT 1:00 PM
Tiny
ELFONDU
  • MEMBER
  • 1 POST
Looking at identical symptoms, on similar miles. What did it end up being, friend?
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Friday, August 17th, 2018 AT 10:01 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,144 POSTS
With only eight volts at the pump I would say its the connector at the pump or the relay. Here is a guide to help you test the relay and the location:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
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Tuesday, August 21st, 2018 AT 11:05 AM

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