I have a friend with an M3W that is not holding fuel pressure. He replaced the fuel pump and also the fuel filter. He now reports the fuel system will hold pressure for about 40 seconds and then returns to zero as measured on the Schrader valve. Clearly, there is a leak in the system somewhere.
My M3W had similar symptoms before I found a crack in my plastic fuel pump assembly and once I replaced the pump all was well again. Does anyone know any problem areas besides the pump plastic where these systems lose pressure? Those crazy plastic clamps at the fuel line connection points come to mind but I have seen them hold pressure fine when in poor shape also. I actually replaced my fuel system with a Morgan Customs unit so I am no help with weak points on the stock fuel system.
I have been told there is no fuel smell or puddling of fuel for obvious clues to where the system is leaking. My friend's car will now not start because it cannot hold the pressure necessary for the fuel injectors to function.
Any ideas here?
