If this is happening to you in an E70 in cold weather, replace the Fuel Pump Relay. Part number 61368373700. It costs about $20.00 plus tax at the dealer. Replace it, get your fuel pressure back up, and it should start right up.

This PSA is brought to you by the letter "C" for "Cheap Fix".

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2016 X5 SDrive 35i Sport
2009 X5 XDrive30 Sport acquired 10/21/16 "Brigette"
2005 530i Sport acquired 5/2014 (wife traded for a milktoast Honda)
1999 528i Sport (306k miles!!) acquired 8/2006 "Prescilla" (sold)
1997 528i acquired 8/2004, "Helga" parted out and gone
1992 735iL acquired 6/2003, "Wanda" sold