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Old 05-12-2015, 07:06 PM
ANM custom ANM custom is offline
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1997 Grand Prix GTP fuel pump problem

1997 Grand Prix GTP...Quick history, had to repair/replace the coupler on the supercharger so all related work (fuel,vacuum lines, Injectors etc were removed/replaced, some broken vacuum lines were broke and repaired, went to start it up and I am getting the symptoms described here for the resistor failure, runs for a few seconds then fuel pressure drops and it dies, did all the described tests and it still dies so I am assuming its not the resistor.
Direct wired the fuel pump (at sending tank) and it runs perfectly, also jumper/bypassed relays (#30 to 87a on speed relay 15) and (#30 to #87 on fuel pump relay 14) runs fine. Test at tank shows voltage when key comes on then none after it starts (pcm sends signal to speed relay), also if I leave the pump relay in and bypass the speed relay (#30 to 87A) it will stay running. I also tried to bypass the resistor all together by unplugging it and jumping across the connector terminals and it still dies.

Pretty frustrating at this point....Any Ideas ??
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Old 08-10-2015, 02:42 AM
tazpal15 tazpal15 is offline
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Re: 1997 Grand Prix GTP fuel pump problem

Sounds kind of like a fuel pump relay. Has two sides. Start side and run side. The run side usually burns out and so it lets you start the engine. But when you release the key. It dies.
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