gf4720p2000mor

Component description for fuel pump

Type gf · topic 47.20 · version 0100 · 2008-03-27

Applies to: ENGINES 275.954 in MODEL 230.477 as of Model Year 09 /Modification Year 08 model refinement package ENGINES 275.981 in MODEL 230.479 as of Model Year 09 /Modification Year 08 model refinement package

Where it sits

Function group 1 Engine › 47 Fuel system, powertrain energy supply › 47.20 Fuel pump, filter — Series 230 (models 477, 479)

Also applies to engines/gearboxes: 275 954, 275 981

GF47.20-P-2000MOR

Component description for fuel pump

21.2.08

ENGINES 275.954 in MODEL 230.477 as of Model Year 09 /Modification Year 08 model refinement package

ENGINES 275.981 in MODEL 230.479 as of Model Year 09 /Modification Year 08 model refinement package

Component description for fuel pump

P47.40-2065-11

View of underfloor

M3 Fuel pump

N118 Fuel pump control unit

Location

The fuel pump is located behind the rear axle on the underfloor.

Task

The fuel pump supplied fuel in sufficient quantity and at the required pressure to the fuel injection system (fuel distribution rail).

Component description for fuel pump

P47.20-0239-05

Design

1 Rotating spindle

2 Drive spindle

3 Check valve

4 Pressure relief valve

5 Electric motor

6 Ground connection

7 Power supply (12 V)

a Fuel from fuel tank

b Fuel to fuel filter with integrated fuel pressure regulator

The fuel pump consists of a jack screw pump.

Function

The fuel pump is actuated as required by the ME-SFI control unit (N3/10) through the fuel pump control unit (N118).

The fuel pump draws fuel from the bottom of the fuel tank swirl pot through a fuel strainer.

The rotating jack screw delivers fuel to the fuel filter by centrifugal force.

A pressure relief valve is integrated in the fuel pump to limit the internal pressure.

The check valve in the fuel pump decouples the fuel system from the fuel tank, by preventing the backflow of fuel to the fuel tank when the fuel pump is switched off.