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2000 grand prix fuel pump relay not activating

Grand Prix This long running model has seen many changes, from a large RWD car, to a smaller RWD car, to a small FWD car, to a large FWD car, and with its available supercharged engines, and powerful V8s, it has never left the limelight as one of the most popular cars in America.

2000 grand prix fuel pump relay not activating

Old 09-09-2018, 01:23 AM
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Default 2000 grand prix fuel pump relay not activating

I have a 2000 grand prix 3.8 non supercharged and while driving it my engine just died. Once I got it home I found that when I turned the key that I did not hear the fuel pump priming. I found that I was getting 12v to the fuel pump fuse and that the fuse is good allowing the 12v to pass through to the relay contact. I then bypassed the relay and found that I could then hear the fuel pump prime. I checked the relay coil and one side I am getting a solid ground connection and the other side I am getting 4.5v when the key is turned. I picked up several of the relays at the local junk yard and after trying them all I finally bent the coil pin on one of the relays so I could apply voltage directly and see if the relay activates. When I put a 12v on the bent pin I heard the relay click and heard the pump prime. I did try to have another person crank the engine while I was manually activating the relay but I didn't have any luck. In my Haynes book it looks like the signal to activate the relay comes from the computer. I could not find listed anywhere what voltage I should be getting from the computer to turn on the relay. Any suggestions would be greatly appreciated.
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