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Old 04-28-2002, 12:42 PM   #1
Scooby Newbie
Member#: 1955
Join Date: Jul 2000
Thumbs up Fuel Pressure 55-60 psi

I dont know if anyone else is having this problem but I had seen somewhere that you can bring down the fuel pressure by drilling a hole in the fpr if you have an rrfpr. The mods that caused this high fuel pressure are the rrfpr and a high pressure fuel pump. This mod of drilling a hole worked. My fuel pressure at idel is approx 32-35 psi. It doesnt stall anymore or hesitate.

Thanks to whomever put this mod up.

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Old 04-28-2002, 01:04 PM   #2
NASIOC Supporter
Member#: 246
Join Date: Sep 1999

Could you explain the drilling a little more? Doesn't fuel leak out?
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Old 04-28-2002, 02:40 PM   #3

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


Call around to junkyards and see if you can find a fuel pressure regulator out of an XT6 or an SVX -- note, only get them out of the 6-cyl cars, 4 cyl's should have the same as our current ones.

This will drop your pressure to perfect levels.

You don't want to drill into the vacuum chamber of the FPR because you might hit the diaphragm, though I suppose you could dissect it and replace the spring with a lighter one, and then put a screw & washer combination in there somehow to make it adjustable. I've seen this on an SE-R board (IIRC) and it looked simple enough... not something I'd risk though.
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Old 04-28-2002, 03:05 PM   #4
Scooby Specialist
Member#: 11931
Join Date: Nov 2001
Location: Winter Park, FL/ SMU @ Dallas,
2001 2.5 RS Turbo


I've heard it said, but I'm not sure that I believe it, that a high (50 psi +) baseline fuel pressure it bad. I have run my fuel pressure around 50 psi at idle for nearly two months now, and it seems to be working fine, though my gas mileage might be suffering a little. No black smoke to prove I'm running rich. So, I guess that I would like to see a little more proof before I believe this theory.

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Old 04-28-2002, 11:21 PM   #5
Scooby Newbie
Member#: 143
Join Date: Aug 1999
Location: Kanata, ON, Canada
1999 Impreza 2.5RS
Supercharged - and STOLEN



The high idle fuel pressure is not bad in the sense it will cause damage.
Go too high on the pressure and the ECU will begin to have trouble controlling idle the required injector pulse width becomes too narrow to the point where idle cant be held any more the motor just dies.

Ive experimented with this myself; I turned in the center adjustment screw on my BEGI RRFPR, slowly raising the idle fuel pressure until it died at about 56 PSI.

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Old 04-29-2002, 09:52 AM   #6
Scooby Specialist
Member#: 11931
Join Date: Nov 2001
Location: Winter Park, FL/ SMU @ Dallas,
2001 2.5 RS Turbo


Well, then maybe thats why my car stalled on me twice yesterday. I noticed that the first time I started it, my fuel pressure was abnormally high, and then the car all of the sudden dies. I start it again and the same thing happens. Start it a third time and fuel pressure resumes its norm. of about 50 psi, and what do you know, I'm golden!

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