ME-SFI fuel supply, function - GF07.61-P-3004G

ENGINE 273 in MODEL 463.202/222/236/237 up to 31.5.12 as of model year 2009/YoM 08

Without code (ZU8) USA version

Fig 1: Identifying ME-SFI Fuel Supply Function Chart

Courtesy of MERCEDES-BENZ USA

For code (ZU8) USA version

Fig 2: Identifying ME-SFI Fuel Supply Function Chart

Courtesy of MERCEDES-BENZ USA

Function requirements for fuel supply for the ME gasoline injection and ignition system (motor electronics) (ME), general points

Circuit 15 ON (ignition ON)
Circuit 87M ON (engine control ON)

ME fuel supply, general points

In all operating conditions, the fuel supply delivers filtered fuel to the injection valves from the fuel tank, in sufficient quantity and at sufficient pressure (injection pressure).

ME fuel supply, function sequence

The fuel supply function sequence is subdivided into the following points:

Fuel pump control function sequence
Fuel delivery function sequence

Fuel pump control function sequence

The fuel pump is actuated directly by the ME-SFI [ME] control unit (N3/10) via the fuel pump relay (N10/2kA).

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

Fuel delivery function sequence

The fuel pump suctions the fuel out of the fuel feed module and pumps it through the fuel filter to the fuel manifold (single line system). In doing so, the fuel pressure is limited by the pressure limiting valve to about p = 3.8 bar.

There is a check valve at the feed point of the fuel filter which prevents reduction of the fuel pressure when the fuel pump is switched off.

The fuel return from the pressure limiting valve supplies fuel to the suction jet pump in the LH fuel tank chamber. The suction jet pump delivers fuel from the LH fuel tank chamber into the fuel feed module (RH fuel tank chamber).

Component description for ME-SFI [ME] control unit

N3/10

GF07.61-P-6000G