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1988 Pontiac Firebird fuel pump blues

Tiny
720DBANDIT
  • MEMBER
  • 1988 PONTIAC FIREBIRD
  • V8
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
I recently installed a fuel pump in my Trans Am, I also replaced the fuel pump relay, and checked all the fuses. The fuel pump will not turn on, when you have the key in the accsories on position, where I should hear the pump sending fuel to the motor. I checked for power going to the fuel pump at the wiring harness connector, there was power going to the pump. If you have any suggestions im all ears
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Thursday, January 1st, 2009 AT 2:00 PM

2 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Did you check the fuse by the battery, fuel pump/ecm?

Also, if you have an oil pressure switch in the fuel pump circuit, once you crank the engine enough to bring up oil pressure and the switch closes, the pump will get voltage. The voltage for the switch and the load side of the relay comes from the same fuse.

The info I looked at was for the 5.0 tbi.
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Thursday, January 1st, 2009 AT 2:21 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Here's your fuel pump and oil pressure sending unit EWD.


https://www.2carpros.com/forum/automotive_pictures/12900_oil_sending_unit_and_fuel_pump_circuit_91.gif

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Thursday, January 1st, 2009 AT 2:29 PM

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