GF07.61-P-3004V ME Fuel Supply, Function

GF07.61-P-3004V ME Fuel Supply, Function







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.