The X5 3.0i, 4.4i and 4.6i use the same fuel pump.
https://www.realoem.com/bmw/enUS/sho...diagId=16_0460
The whole assembly is
PN 16116755043, about $320 at dealer.
I use the BMW dealer in Lincoln NE a lot, prices are good and shipment is fast:
https://www.bmwdirectparts.com/
The ONLY way to get the fuel pump (instead of the whole assembly) is Ebay.
Go to ebay and enter "Pierburg 16116755043", there is a seller selling the Pierburg (which is genuine OEM) fuel pump for $150.
NOTE: Aftermarket pumps are mostly made in China. Quality is unknown. This part can get you stranded in the middle of nowhere. My personal opinio is either whole assembly at dealer ($320) or the Individual Pierburg fuel pump ($150), and nothing else. When you think about it, $320 for every 165K miles is a great price!
PS: While there, search forum for
Siphon Pump Repair, buy that
$3 O-ring and replace it. Add Teflon as needed for the LOWER part of the coupling. All info is in that thread.