It’s common for the filler/FPR to mask low output fuel pump. Did you ever estimate your engine on hours?

My money is on weak fuel pump.

Sadly a real pita to test there's no test port. You have to add in a T between the pump and filter (though not difficult if you have the under belly off from filter change)

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)