Patent ID: 6752130
Filing Date: 2004-06-22
Classification: F02M

Abstract:
A fuel injection system for an internal combustion engine, the injection system comprising,a high pressure pump (18), a prefeed pump (10) by which fuel is pumped out of a fuel supply container (12) to the high-pressure pump (18), a reservoir (24) connected to the high pressure pump (18) for receiving the high-pressure fuel, at least one injector communicating with the reservoir (24) for injecting fuel into the engine, a fuel filter (20), disposed between the prefeed pump (10) and the high-pressure pump (18), a return line (38) for uninjected fuel leads back from at least one injector (26) into a region upstream of the high-pressure pump (18), and a valve (40) connected in the return line (38), the valve (40) being operable in a first switching position to connect the return line (30) at a position upstream of the fuel filter (20), between the filter and the prefeed pump (10), and a second switching piston connecting the return line (38), to the return line (38) downstream of the fuel filter (20), between it and the high-pressure pump (18).