Fuel Pump: Description and Operation

FUEL PUMP




An electric fuel prime pump supplies fuel to low pressure fuel system. The fuel pump is used to prime the fuel system after changing the fuel filter or servicing the fuel system. This fuel pump is powered by the fuel pump relay that is controlled by the engine control module (ECM). The pump is part of the diesel fuel conditioning module (DFCM) assembly. The module assembly is located under the vehicle forward of the fuel tank.