Fuel pump relay replacement

1998 GMC SIERRA
200,000 MILES • V8 • 4WD • AUTOMATIC
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DMAIR
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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
Jan 23, 2010 at 3:03 PM
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RASMATAZ
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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

Jan 23, 2010 at 4:14 PM
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DMAIR
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Thats does make a lot of sense. Thanks so much for your quick response.

Doug
Jan 23, 2010 at 7:55 PM
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