1994 Chevy Truck no power to fuel pump

Tiny
RIGHTTOO
  • MEMBER
  • 1994 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
My truck stalled on me and I was not able to get it running agian. I realized it was a fuel problem so I replaced the pump, relay, and fuse, my pump is still not turning on when I turn the key.
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Saturday, November 8th, 2008 AT 2:14 PM

5 Replies

Tiny
MASTERTECHTIM
  • MEMBER
Check for power at the gray wire at the relay when you turn the key on and if you have power for 2 seconds then the gray wire must be broken from there to the tank.
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Saturday, November 8th, 2008 AT 2:25 PM
Tiny
RASMATAZ
  • MEMBER
The fuel pump should come On for 2secs only when the computer energizes the fuel pump relay. If not its coming from the computer relay driver-

Try this use starting fluid thru the throttle body and see what happens-


http://www.2carpros.com/forum/automotive_pictures/12900_oil_sending_unit_and_fuel_pump_circuit_81.gif

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Saturday, November 8th, 2008 AT 2:26 PM
Tiny
RIGHTTOO
  • MEMBER
When I turn the key on and test the fuel pump fuse with a test light. It shows no power on either side. Iam wondering if it is a computer related problem or a short in the wiring. But if I unplug the wiring harness from the sending unit and test the wires there the center wire has power. Also when I turn the key on the pump makes a one click sound but does"nt fully kick on. And if I dump fuel down the TBI it will start. Please give me your input on this if you can. It is not to often that I can"t figure something out on my own, but this one has me stumped thank you
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Saturday, November 8th, 2008 AT 8:09 PM
Tiny
MASTERTECHTIM
  • MEMBER
With key on you should have power at one termianl of relay(orange wire) dark green should pule a ground for 2 seconds when key is turned on which will energize the relay and send power to the gray wire. What are we missing?
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Sunday, November 9th, 2008 AT 5:34 AM
Tiny
MASTERTECHTIM
  • MEMBER
Whn you turn the lkey to run position with truck off is the check engine light illuminated? It should be, if not check inj fuse
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Sunday, November 9th, 2008 AT 5:35 AM

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