Question about 2002 Pontiac Grand Am
I'm actually looking for the diagram of the wiring back at the pump. There's a bulkhead where the wires come back to the pump and sending unit then a section of harness goes to the pump and sending unit. I'm trying to figure out why I have no running fuel pump. It may be bad but I'm trying to verify that it's getting power and ground before just throwing a pump at it. Jack layton sent me a diagram of the fuel pump relay which is helpful but only if the wire colors stay the same as they get to the back of the car. What I really need to know is AT THE BACK OF THE CAR, which wires should have power and which wires should be ground and which wires run the pump and which run the sending unit. The gas gauge works but the fuel pump does not. I had someone turn the key on as I smacked the bottom of the tank to see if the pump would cycle on but it did not. That often works a couple of times and is often a cheap and easy way of determining if the pump is bad. It's not working this time so I have to probe wires and make sure, again, before just throwing parts at it. Anyone can do that and I don't want to charge the guy for guesswork, especially if I put a pump in and it still doesn't run. This car had issues with the security system, it had a switch put in that would reset it and you have to do the relearn process and the security light stays on. I bypassed the entire system with a resistor. I have spark and if you squirt fuel down the throttle body it runs. So I know I have ignition and spark. I don't have fuel pump. Thanks, Wayne Thomas
Go to the link and look up your wiring diagrams on the site. http://bbbind.com/free_tsb.html
Posted on Dec 07, 2016
Testimonial: "Thank you so much for your help! I wasn't sure which catagory to look under, I think I went to the wrong one because I found nothing to do with the fuel system. Maybe if you're familliar with those diagrams you know which one to look under? I'd REALLY appreciate it if you could help direct me a little more. Thanks, Wayne"
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Posted on Jan 02, 2017
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