fuel level sender can get gummed up. You can *try* some fuel system cleaner in the tank, but usually you have to pull the pump/sender, lightly clean the sender with some scotchbrite or very fine abrasive, and if that fails replace it.

How many miles on the beast?

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual