2.5 TDI Quattro was running perfect.... all i did was change the fuel filter... now the car won't start. I've gone through two batteries cranking it over upon investigarion I see the electric pump in the tank is suspect. Wiring it up to 12v it makes a humming noise, but with the large output hose disconnected I do not get any fuel coming out, should it not just gush out ?? Maybe car never 'needs' the electric pump to start if it had no air leaks in the system ? To get me going I'm looking at priming the system from the boot using a garvity fed fuel can ontop of roof then reconnecting connecting. As for removing the pump - looked at my Ebay DVD manual and looks a total nightmare to remove the electric pump and tips on the final stage of removing it from base of tank !