Check the vent line and fuel pressure before you jump to conclusions. If it really is higher than it should be there is a chance that the return line or maybe a syphon jet line got pinched or restricted somehow when you installed the new pump. You'll have the pump out in 5 or 10 min. the second time and then also have a look at while the fuel gauge isn't working. What is with your syphon jet ??

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