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GM Tech (Cam)
GM Tech (Cam), Pontiac Technician
Category: Pontiac
Satisfied Customers: 29427
Experience:  GM Grand Master Technician 2007. 14 years experience.
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97 Sunfire: the fuel pump and the car still wont start..harness

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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?

Greetings and Welcome to Just answer.\

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

Customer: replied 6 years ago.
yes

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

 

Is the fuse good?

Customer: replied 6 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

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

 

Customer: replied 6 years ago.
tried that as well, switched it with the ac relay
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 6 years ago.
ok I'll try this and get back to you
OK.
Customer: replied 6 years ago.
bad connection in a black connector just behind hood release inside car. thanks for your help
That will do it. If that is all you need, please accept my answer, but you can always reply if you need.
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