Component description for the fuel pump - GF47.20-P-2000AMG

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ENGINE 156.980 in MODEL 164, 251

ENGINE 156.982 in MODEL 209

ENGINE 156.983 in MODEL 211, 219

ENGINE 156.984 in MODEL 216, 221

Location except model 216, 221 (shown on fuel tank model 164)

Both fuel pumps are installed in the fuel feed module in the right fuel tank chamber.

Fig 1: Identifying Fuel Pump Component - Location Except Model 216, 221 (Shown On Fuel Tank Model 164)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Location on model 216, 221

The fuel pump is installed in the fuel feed module in the right fuel tank chamber.

Fig 2: Identifying Fuel Pump Component Location On Model 216, 221

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Task

The fuel pump(s) provide the fuel in an adequate quantity and at the required pressure of 4.0 to 5.5 bar (for model 216, 221 from 4.6 to 5.5 bar) to the fuel injection system (fuel manifold).

Design

The fuel pump is a two-stage dynamic pump.

A fuel strainer is installed at the bottom as a coarse filter for the fuel pump feed.

Function except model 216, 221

The left fuel pump is actuated via the left fuel pump control unit (N118/3) and the right fuel pump is actuated via the right fuel pump control unit (N118/4), single-phase controlled The fuel pumps are actuated independently of each other according to fuel requirements. They draw fuel from the fuel feed module through a fuel strainer.

The fuel pump then pumps the suctioned fuel via the fuel filter with pressure limiting valve to the fuel distributor rail. The pressure limiting valve limits the fuel pressure in this case to a maximum of 6.0 bar.

Function for model 216, 221

The left fuel pump is controlled 3-phase according to fuel requirements via the left fuel pump control unit (N118/3). It draws fuel from the fuel feed module through a fuel strainer. The fuel pump then pumps the suctioned fuel via the fuel filter with pressure limiting valve to the fuel distributor rail. The pressure limiting valve limits the fuel pressure in this case to a maximum of 6.5 bar.