Year of mfg 2003. The car has always run very well. Last week on 2 occasions it was very difficult to start though worked well once running. Since then whilst the engine turns over it won't even try to start. I noticed there is a hissing bubbling noise coming from the fuel tank when the pump is powered up, I removed the hose from this pump outlet and connected a seperate tube, when the pump is powered fuel flows from this tube so the pump seems to be working okay. Could it be the pre-pump that is fed from this (tank) pump that is not working? could the unusual noise coming from the tank be a pressure overflow on the tank pump? I really do need to use the car but right now don't want to pay BMW towing and repair costs. Any useful suggestions or comments would be appreciated.

Mike W, September 2010