Stock FPR
#1
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Join Date: Dec 2007
Location: Brampton, ON, Canada
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Stock FPR
I am wondering if I can leave the fpr connected to vacuum with my turbo on the car. It's at around 5 psi and the previous owner unplugged the regulator and left it open to atmospheric pressure. If I reintroduce it to a vacuum line and go into boost will the fpr be able to handle it? I've heard of diaphragms going crappy under boost and don't want that to happen.
#4
The fuel pressure regulator works to maintain a certain fuel pressure relative to manifold pressure. Flow is based on deltaP. It seems to me that by removing it's vacuum/pressure signal, it can no longer function as intended. I haven't heard of positive pressure being a problem for the FPR. Maybe somebody with more experience will chime in.
#6
For a turbo car, WOT is generally not 0 psig, but rather whatever boost pressure you are running.
I suppose this all doesn't matter much if you have a standalone ECU because you can just tune the fuel map to compensate for the different fuel pressure.
#8
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Wait... The previous owner disconnected the vacuum line to the stock FPR? Reconnect that bitch! The stock FPR's job is to maintain a constant pressure differential across the injectors. It has no problem at all with seeing boost.
#14
I know someone that had the FPR go bad on a non-boosted 97. Drove him nuts trying to find the problem since no one though of the FPR on a NA car.
Funny... that's one of the first things I usually check. I had 2 go bad on my cavalier, 1 on my brothers camaro, and 1 on the wife's taurus. I always suspect the FPR first.
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