ME fuel supply, function - GF07.61-P-3004V

ENGINE 272.920 in MODEL 203 up to Model Year 8

ENGINE 272.922 in MODEL 211

ENGINE 272.940 in MODEL 203 up to Model Year 8

ENGINE 272.941 in MODEL 203 up to Model Year 8

ENGINE 272.942 in MODEL 171 up to Model Year 8

ENGINE 272.943 in MODEL 211, 219

ENGINE 272.944 in MODEL 211

ENGINE 272.945 in MODEL 251 up to Model Year 8

ENGINE 272.946 in MODEL 221 up to Model Year 8

ENGINE 272.960 in MODEL 203 up to Model Year 8

ENGINE 272.963 in MODEL 171 up to Model Year 8

ENGINE 272.964 in MODEL 211, 219

ENGINE 272.965 in MODEL 221 up to Model Year 8

ENGINE 272.966 in MODEL 230 up to Model Year 8

ENGINE 272.967 in MODEL 164, 251 up to Model Year 8

ENGINE 272.970 in MODEL 203 up to Model Year 8

ENGINE 272.972 in MODEL 211

ENGINE 272.975 in MODEL 221 up to Model Year 8

ENGINE 273.922 in MODEL 221 up to Model Year 8

ENGINE 273.923 in MODEL 164 up to Model Year 8

ENGINE 273.924 in MODEL 221 up to Model Year 8

ENGINE 273.960 in MODEL 211, 219

ENGINE 273.961 in MODEL 216, 221 up to Model Year 8

ENGINE 273.962 in MODEL 211

ENGINE 273.963 in MODEL 164, 251 up to Model Year 8

ENGINE 273.965 in MODEL 230 up to Model Year 8

ENGINE 273.967 in MODEL 209

ENGINE 273.968 in MODEL 221 up to Model Year 8

ENGINE 272.940 in MODEL 209

ENGINE 272.960 in MODEL 209

Shown on engine 272 in model 171

Fig 1: ME Fuel Supply Function Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The fuel supply system must make available to the injection valves an adequate quantity of filtered fuel from the fuel tank, and at an adequate pressure (injection pressure), in all operating conditions.

The fuel pump suctions the fuel in the fuel tank and delivers it through the fuel filter with fuel pressure controller to the injection valves at the fuel distribution tube (single-line system).

The pressure regulator regulates the fuel pressure in the process to approx. 3.8 bar.

Both fuel pressure reservoirs and the high-volume fuel distributor rail ensure that in the event of abrupt acceleration, sufficient fuel is available at all injection valves.

The return line from the fuel pressure regulator supplies a suction jet pump which supports filling of the swirl pot in the fuel tank.

The voltage supply for the fuel pump is performed via the fuel pump relay.

The injection valves actuated by the ME-SFI [ME] control unit spray finely atomized fuel into the inlet ports.

Diagnosis

If the fuel pressure is too low, combustion misfires can occur which are stored in the fault memory. A cause for this can, for example, be a soiled fuel filter.

Therefore check the delivery rate of the fuel pump at the feed point to the fuel manifold during combustion misfires.

If combustion misfiring occurs at one cylinder bank only, the respective fuel pressure memory may be the cause.

Component description for the ME-SFI [ME] control unit		GF07.61-P-6000V
Component description for the fuel injection valves		GF07.03-P-6010V
Component description for the fuel pump relay		GF47.20-P-2010V
Component description for the fuel filter with fuel pressure regulator	Model 171	GF47.20-P-2110V
	Model 211, 219, 164, 251, 216, 221 Model 203, 209 with engine 272.960/970, 273	GF47.20-P-2110VB
	Model 203, 209 with engine 272.920/940/941 Model 230	GF47.20-P-2110VC
Component description for the fuel distribution rail		GF07.61-P-6020V
Component description for the fuel pump		GF47.20-P-2000V
Component description for the fuel tank	Model 171	GF47.10-P-2000VA
	Model 211, 219, 216, 221 Model 203, 209 with engine 272.960/970, 273	GF47.10-P-2000VB
	Model 164, 251	GF47.10-P-2000VC
	Model 203, 209 with engine 272.920/940/941	GF47.10-P-2000VD
	Model 230	GF47.10-P-2000VF