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Sometimes my fuel pump runs after I turn the truck off

Tiny
PATRICK.L.FREED73
  • MEMBER
  • 1987 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 97,000 MILES
I can hear humming in the fuel tank. I started the truck and pulled forward then reversed it to rock the fuel and it turned off. What do I need to replace to solve this problem?
Saturday, June 8th, 2019 AT 1:37 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

If you pull the relay, does the pump stop running?

It could be either the relay sticking, the oil pressure switch is bad or the ECM is not stopping the ground for the relay.

Try pulling the relay first.

Roy
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Saturday, June 8th, 2019 AT 1:51 PM

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