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Old 04-08-2011, 09:22 PM   #4
Registered User
Join Date: Jun 2010
Location: Satellite Beach, FL
Posts: 272
My Ride: 2001 M5
So, the X5 is still exhibiting the same problem. However, I'm thinking it is somehow still related to the fuel pressure regulator on the fuel filter (even though I replaced it a little after the problem started). I replaced the vacuum lines from the intake elbow to the fuel filter regulator, replaced the transfer pump, and fuel pump. The fuel pressure is still staying at 51 psi when the vehicle is running, but the residual pressure drops very quickly (about 20 psi in 20 minutes). It is supposed to drop no more than 7 in the same period. I'm hoping this is it, but I am not sure. Does anyone have any suggestions or had similar problems?
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