Fluctuating fuel pressure - any fixes?
The fuel pressure on my M30 will typically sit at 42 lbs. Just right.
Occasionally after the car has been running a while, the FP will drop to about 35 or 36 lbs and stay there. At least until the car is off and sits for a while.
The lower FP messes up the mixture and the car runs a bit leaner than I would like, especially on idle.
Any ideas short of replacing the fuel pump? The FPR has been swapped with a different unit and the behavior is consistent so I don't think it's the FPR.
Ideas?
Jeff
Bellevue WA
90 535iM - not much stock remains. 3.7 liters, ported head, cammed, 3.73 diffy, M5 brakes, MAFed, yadda yadda yadda
86 Porsche 951 - Track Toy