1996 Chevy S-10 fuel pump

Tiny
STLEEGL
  • MEMBER
  • 1996 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 80,987 MILES
What would cause the fuel pump to run constantly with the key off and the relays under the hood diconnected?
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Saturday, July 26th, 2008 AT 8:24 PM

1 Reply

Tiny
SWILLIAMS
  • MEMBER
Sounds like the oil pressure switch is stuck on. The relay doesn't power the pump full time. The relay and computer power the pump for a few seconds just to build pressure in the system. Once the engine starts it builds oil pressure and that activates a pressure switch. That switch actually powers the pump. It also acts as a safety. No oil pressure and the engine won't run.
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Tuesday, July 29th, 2008 AT 9:36 PM

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