Excellent info Andrewwynn! I have read your thread on how the E53 fuel system works and appreciate all the effort you put into posting your findings! Do you have a part number for the O-ring you added to the syphon jet fitting? Maybe that could be repaired differently ?

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)