Problem: My car runs for 4s, then dies.
Observation: Fuel pressure on crank goes to 40psi, then slowly drops to zero, at which point the car obviously stalls.
Notes: I thought something was wrong with my fuel pump, and/or the relay. It is not the pump for I got a used one and the same problem remained.
Fix: The fuel pump relay in my car (green relay, 4 wires. 2001 RS) has 2 black/red wires. one is hot on start. The way I get my car working is to bridge the two black red wires together, and my car is working perfectly now. I traced the black/red wire on the wiring diagram: black/red (4) to fuel pump. For some reason, the black/red wire in question goes hot then off, which is turning the fuel pump off, hence why the car dies. Bridging the hot on start black/red wire to the black/red wire in question fixes this problem. But I want to know if any wiring gurus know what is wrong with that black/red wire to fuel pump.
My wiring harness was redone and I am running a Haltech in it right now. Thanx in Advance.