Working on my buddys 95 m3 and came up with some questions bout the fuel pressure. Seems the gauge on the adjustable regulator reads 56psi at idle, 64psi with a little rev, and off it drops within a minute to 42psi, then slowly bleeds down to 0 (within 10 minutes).
Car off, ignition position 2, fuel pump buzzes and pressure goes to 42 psi, and slowly and steadily bleeds down while still in pos 2.
Should the pressure hold longer while the car is off? And how are those operating pressure #'s?