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Originally Posted by 7futures
At initial prime, the pressure is at 55. Then after 2-3 seconds, the pressure drops to 10 and the engine stalls. by pumping the gas it does run longer but it runs rough starving for fuel. I spoke to a tech that works at a local dealer, and he said he would have to trace the problem on a schematic.
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In your case it looks like the problem will need to be troubleshot because it may be a wiring problem. I see the relays were changed but how about the fuel pump resistor. The second relay is the fuel pump hi-speed relay and the fuel pump resistor works in conjunction with that relay. You can perform a visual inspection by removing the passenger headlight and check the condition of it and the wiring. Also, you could try a bypass procedure.
The wiring diagram the tech is talking about is no mystery and consists of one simple page out of the Grand Prix service manual.