I have the same issue. Took everything apart last week to see what was leaking, and it appeared to be the pump. So I ordered a new pump.
Installed the new pump yesterday and it still leaks…but not until the car has been driven. If I fill it up and not go anywhere, it's fine. The vibration of driving must make it leak.
So next week I'll be taking it apart for a third time, to replace the pump grommet / filter and a section of the hose.
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2014 F32 428i M-Sport
2018 F15 M-Sport
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