The float for level doesn't interfere with fuel delivery, however if you don't know how much fuel, add enough to know you have 1/2 tank and test.

Siphon jet problems occur close to 1/3 to 1/4 tank and could cause a delivery problem but usually it isn't power problems it's fuel starvation stall.

When fuel pump is near end of life, the FPR will hide a weak pump and symptoms show up under moderate to heavy demand.

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