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GM Tech (Cam)
GM Tech (Cam), Pontiac Technician
Category: Pontiac
Satisfied Customers: 27662
Experience:  GM Grand Master Technician 2007. 11 years experience.
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97 Sunfire: the fuel pump and the car still wont start..harness

Resolved Question:

97 Sunfire, just replaced the fuel pump and the car still wont start. I have 12v. at the pump harness with pump unplugged for about 3 seconds when I turn the switch on. When I plug the pump in I have NO voltage going to the pump when I cycle the ignition switch. What gives? PCM maybe?
Submitted: 4 years ago.
Category: Pontiac
Expert:  GM Tech (Cam) replied 4 years ago.

Greetings and Welcome to Just answer.\

Is the check engine light on when you first turn the key on?

Customer: replied 4 years ago.
yes
Expert:  GM Tech (Cam) replied 4 years ago.

Ok, does the fuel pump relay click when you turn the key on?

 

Is the fuse good?

Customer: replied 4 years ago.
yes all is good everything works as it should with the pump unplugged, as soon as I plug it in I have 0 voltage going to the pump
Expert:  GM Tech (Cam) replied 4 years ago.

OK, have you swapped the relay? A poor contact would cause this. Try a different one in the fuse block.

 

Customer: replied 4 years ago.
tried that as well, switched it with the ac relay
Expert:  GM Tech (Cam) replied 4 years ago.
Ok, try running a fused wire from the battery to the feed on the relay. This could be a bad wire. A single strand of wire can handle 12v, but no amps. And then adding a load to the that single strand or poor connection will do exactly that.
Customer: replied 4 years ago.
ok I'll try this and get back to you
Expert:  GM Tech (Cam) replied 4 years ago.
OK.
Customer: replied 4 years ago.
bad connection in a black connector just behind hood release inside car. thanks for your help
Expert:  GM Tech (Cam) replied 4 years ago.
That will do it. If that is all you need, please accept my answer, but you can always reply if you need.
GM Tech (Cam), Pontiac Technician
Category: Pontiac
Satisfied Customers: 27662
Experience: GM Grand Master Technician 2007. 11 years experience.
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