I had a fuel pump go out the other day, what bothers me is that it was one I had brought just over a year ago and had maybe 6,000 miles on it. The electric motor in the pump sounded fine but no flow/pressure. I took the pump apart and found a very, very small piece of alumnium stuck in the pump part which jammed it and that broke this delicate plastic drive that connects the electric motor to the pump. I do not know how it got there for sure but I did just put new filters on, the lesson is be VERY careful these pumps do not except any I mean ANY debris. I will now check new fuel filters, pumps, regulaters etc any thing before the pump and after the filter before it goes on this car. I hope this helps, Fritz
Fritz First, I assume you are talking about a 400i with high pressure pumps. The filters do not protect the pump they are AFTER the pump on the pressure side. The pump inlet is the large diameter hose directly from the gas tank "well". The problem that you have puts you at the mercy of the gasoline dealers (they normally have very good filters) but your own car's fuel tank and filler hardware. I would take a good look at your filler inlet and see if there is anything missing or broken off. Solution: a very coarse or very large fuel filter could be installed between the tank and the pump. You do NOT want the have the fuel to flash at the pump inlet due to pressure drop; this is a classic NPSH issue. (Net Positive Suction Head) Ken
Ken, You are right, of course the filters are after the pumps. I think you are on to something, with installing a filter before the pumps. I have after market tanks and I think I got some aluminum bit from them. One little bit and $$$ Thanks, Fritz
