Fuel Delivery Module, Function

Fuel Delivery Module, Function




80 Fuel tank
80/5 Splash bowl
80/11 Fuel strainer
90/10 Suction jet pump
B4 Fuel level sensor
M3 Fuel pump
A Nozzle
B to splash bowl
D Fuel pressure line
R Fuel return flow
Z inducted fuel

Fuel gauge sensor function
The fuel gauge sensor (B4) is a lever-type sensor with potentiometer and sliding contact. The resistance is analyzed in the electronics of the fuel gauge.

Low resistance = fuel tank empty
High resistance = fuel tank full

Note: If an open circuit in the wiring exists, the fuel gauge in the instrument cluster indicates empty; the fuel reserve indicator lamp does not come on.

Splash bowl function
The splash bowl (80/5) is reliably filled with fuel up to a certain level by means of the line from the suction spray pump (B). When cornering with a low level of fuel in the fuel tank, it prevents the fuel pump drawing in air.

Suction spray pump function
The nozzle (A) in the suction spray pump accelerates the returning fuel (R). The fuel jet produces a suction effect and improves the fuel supply for the feed line (B) to the splash bowl.