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Old 06-03-2002, 01:33 PM   #1
Scooby Specialist
Member#: 626
Join Date: Dec 1999
Location: Miami FL
2001 Impreza 2.5 RS
Black Diamond Pearl

Question Fuel Pump Relay Question

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.
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Old 06-03-2002, 02:15 PM   #2

Member#: 922
Join Date: Feb 2000
Chapter/Region: MWSOC
Location: Schaumburg, IL
16 WRX (white)
04 FXT (red)


Nick - I'll check on those pinouts in the PM in a couple of days when I get the manuals back... they're on loan for a few.

I bet your fuel pump runs all the time after you just turn on the key now, right? Not that it'd matter much unless you have someone with you that likes listening to the radio while the car is off. *shrug*

BTW, congrats on getting her up & running.
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Old 06-03-2002, 03:31 PM   #3
Scooby Specialist
Member#: 626
Join Date: Dec 1999
Location: Miami FL
2001 Impreza 2.5 RS
Black Diamond Pearl


yeah, I am wondering if maybe the 2 black/red wires should be swapped.

Can anyone tell me what happens to Black/Red (2) (top right wire) when you switch your car from off to on (without cranking)? And what happens to Black/Red (4) (bottom right)? When using a test light, my #2 is constant hot, and #4 is going on, then off. This is where the prob lies cuz #4 goes to the fuel pump in the back.

Maybe I need to swap the wires.
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