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Old 09-13-2007, 08:36 PM   #4
Black Lotus
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Re: FPR/pump questions.

I put a Walbro 255 pump on my turbo car and had no problems with the GM FPR. The return line was 5/16 dia., I think. My only objection with the pump was that it was a bit noisy when cold. The upper pressure limit for the pump was about 105 PSI (the blocked line test). I only ran it at about 80 PSI, with a rising rate regulator, so there was plenty of flow volume.
As an aside, my OEM pump would run about 45 PSI at atmospheric, and about 55 PSI at 10 lbs boost. Since the pump wasn't capable of going over 60 PSI (the blocked line test again), a higher pressure pump was necessary.
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