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My f10 n55 fuel pump makes noise when fuel level is above 1/4 but below 1/2 tank. It is a gurgling noise and is VERY LOUD. Can hear while driving and while parked. I replaced pump at my cost of $700 and STILL have the noise !!!! Now i am thinking of either sound proofing the rear tank/seat area...

I have this EXACT SYMPTOM on my 2014 bmw 535i xdrive.....Growling/ noise when fuel tank is below half but above 1/4 tank. It is loud inside car at idle but even LOUDER when outside the car under the rear passenger seat area. I paid out of pocket to have the Fuel Pump Replaced ($780) and the...