A lot doesn't make sense with this and I get a feeling there is more to the story. Can you get fuel pressure (not just flow at zero pressure) at the pump? What happened leading into this ? Maybe make sure the pump is getting a full 12volts while you have access to it.

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