Fuel Pump: Description and Operation

GF47.20-P-4141T Fuel Feed Module, Component Description
- ENGINE 642 in MODEL 211.0 /2 /6, 219.3





Shown on model 211.0
75 Fuel tank
88 Fuel feed module
B4/1 Left tank half fuel level sensor
B4/2 Right tank half fuel level sensor
M3 Fuel pump

Location
The fuel feed module is integral with the fuel tank.

Task
The fuel feed module ensures delivery of fuel to the fuel pump through the swirl pot when the fuel level in the fuel tank is low and while driving around longer curves.





Function
The fuel feed module with the fuel pump and the "fuel level sensor, right half of tank", is mounted in the right fuel tank chamber.

The following components are located in the left fuel chamber:
- End plate with connection fittings
- Line plug
- Suction jet pump
- Left tank half fuel level sensor

The fuel flows from the electrical fuel pump in the fuel feed module, through the fuel pressure line via the connection to the fuel main filter. The fuel pressure is controlled by the fuel pump at 8 bar. Excess fuel flows back via the return flow connection through the suction jet pump and the fuel line into the right fuel tank chamber.

A suction effect is produced in the suction jet pump which draws the fuel from the deepest point out of the left fuel tank chamber and delivers it into the fuel feed module. This ensures that the left chamber is properly emptied. The housing of the fuel feed module serves as a swirl pot. When cornering with a low level of fuel in the fuel tank, it prevents the fuel pump drawing in air.