hi
i have changed my bimmer's fuel pump several times, first with an original BMW part which lasted for several months, then with a Mitsubishi (i don't know which model) used one !! which lasted for more than a year, finally when that failed I put on a Korean fuel pump, I don't know how much will that last but it costs 10th the price of a BMW, the Korean pump is used for Hyundai, Kia and Honda as they claim, it costed me about 25$ while the BMW one costed 170$
I think this Korean one is not original, but it works, and the pressure is 3 bar