Fuel Delivery Module, Basic Function - GF47.20-P-2004A

Engine all (4xWD) 

Engine all (CAR) 

Courtesy of MERCEDES-BENZ USA

Shown using model 177 as an example 

Overview 

This document contains information on:

• General
• Function

General 

The fuel delivery module with fuel pump (1) is integrated in the fuel tank. The housing with the integrated fuel pump is located at the lowest point of the fuel tank.

The fuel delivery module with fuel pump (1) consists of the following components:

• Fuel pump (FP)
• Fill level sensor
• Fuel filter
• Suction jet pump
• Swirl pot

Function 

The fuel is intaken by the fuel pump in the fuel delivery module with fuel pump (1) and flows through the fuel pressure line via the connection to the fuel filter. The fuel delivery pressure is regulated by the fuel pump. Fuel that was delivered but is not required flows back into the fuel tank via the return line connection. When the fuel is drawn in through the fuel pump, this creates differential pressure in the suction jet pump. The suction jet pump thus permanently delivers fuel from the lowest point of the fuel tank to the swirl pot of the fuel delivery module with fuel pump (1). This ensures that the fuel tank is emptied on the one hand, and prevents the intake of air through the fuel pump when cornering with a low fuel level on the other hand.