For my '04 e52 3.0, I got a Delphi at an Auto Zone for about $145. All you need is the pump, not the whole assembly. You can re-use the structure, although it's a bit of a pain to get out the pump cylinder, but less expensive. There was also a 20% off coupon floating around on that site or advanced auto parts.

It's a fairly easy job, but take note and pics as you do it. Putting back the pump structure took several shots - again, take pics of the position of the structure when you remove it. Also, screwing back the top cover took several tries, as you have to rotate it just right. I suggest you mark the top position of the cover on the edge of the tank before you remove it, so you don't forget how it went.

Remove the pump from the white plastic brace carefully by pushing up on an edge of a table. Good luck

BY THE WAY: Pumps can go bad in summer if you don't keep the tank at least 1/3 full. Apparently, the gas keeps the pump cool, and if you keep running low, it overheats.

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1999 740IL - brand spanking new on lease til 04
2004 X5 3.0 - not so new any more!