F Press Regulator not controlling the flow of return

[rob101]

Time to try a new FPR? They are expensive little buggers though... perhaps go for one from a breaking yard- AFAIK they either work or they don't, or on eBay you can get variable ones with gauges on them very cheaply.
Nick

NAAAAAAAAHHHHHHH, got mine for about 150 AUD shipped (can't remember exactly) from REPCO (aka RAPECO or "**** off i am not paying that much for an oil filter")
it was a bosch part as well

[Gene in NC]

New FPR fixed most of prob. Ran like crap for awhile but settled down and now running fine. But, FP not steady. Bounces around like maybe the vac is irregular. Engine does have a bad lobe but good compression. Would that combination cause FP to have high frequency bounce?

FP also reads about 39 but suspect that is in FPM.

[Ausmpower]

Would that combination cause FP to have high frequency bounce?

at idle? A combination of vacuum pulse and injector cycle I'd think, that and no pulsation damper in that new pump of yours.....

FP also reads about 39 but suspect that is in FPM.

What does FPM stand for?????

Did you put a new filter in when you changed the pump?

Did you wire in a new relay to supply power to the high flow pump? (they pull LOTS of amps and BMW fp wiring can sometimes cause dramas)

HTH
Rossco

[Gene in NC]

Every thing worked out. Sweeny, mye28.com, was right. Turbo guys run Walbro 255 with stock e28 535 FPR. Runs great. Mileage unchanged. My Walbro was a "deal" off Ebay for less than $100. Best part is high perf pump in tank eliminates need for econd pump, e30/28 and others use two pumps, in tank to lift and external to pressure.