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Fuel pump relay replacement

Tiny
DMAIR
  • MEMBER
  • 1998 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
I have to remove the fuel pump relay and bypass it to get the fuel pump running. Once the truck starts I can replace the relay and drive. Any ideas

Thank you

Doug
Saturday, January 23rd, 2010 AT 3:03 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Sounds like the computer control of the relay is defective-when you jump start the relay -you prime the system for 2secs when it fires up-what powers it after the 2secs is the fuel pump/oil pressure sending unit.


https://www.2carpros.com/forum/automotive_pictures/12900_oil_sending_unit_and_fuel_pump_circuit_100.gif

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Saturday, January 23rd, 2010 AT 4:14 PM
Tiny
DMAIR
  • MEMBER
  • 2 POSTS
Thats does make a lot of sense. Thanks so much for your quick response.

Doug
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Saturday, January 23rd, 2010 AT 7:55 PM

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