Quote:
Originally Posted by 80stech
There is a check valve built into the fuel pump. The only difference with some of the older cars AFAIK is that the pressure regulator is removable from the filter on some of the older ones.
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Ok, so then my 2 yr old Delphi fuel pump could be the culprit. Its also only putting out 40psi at the rail, so maybe I need to spring for an OE BMW part. I seem to recall 50psi is the magic number but will look in Bentley.