Fuel Delivery Module, Function

Fuel Delivery Module, Function




86 Union nut
87 Push spring
88 Fuel delivery module
89/1 Left closing plate
Pin 1 Fuel pump ground
Pin 2 Fuel gage sensor
Pin 3 Fuel gage sensor
Pin 4 Fuel pump circuit 87
89/2 Right closing plate
90 Fuel pressure line to connection A
91 Fuel connecting line
95 Suction spray pump
B4/1 Left fuel gage sensor
B4/2 Right fuel gage sensor
B4/3 Fuel tank pressure sensor (USA)
M3 Fuel pump (FP)
A to fuel filter with integrated fuel pressure regulator
B Return flow from fuel pressure regulator
C Fuel intake from left fuel chamber to delivery module

The fuel flows from the two stage fuel pump in the delivery module through the line (90) to the left closing plate and further on from connection A to the fuel filter with integrated fuel pressure regulator. Excess fuel flows back through connection B and the suction spray pump (95) and connecting line (91) into the right chamber. A suction effect is produced in the suction spray pump (95) which draws the fuel from the lowest point out of the left fuel tank chamber to the delivery module. This ensures that the left-hand chamber is emptied.

The fuel delivery module housing is used as a splash bowl. When cornering with a low level of fuel in the fuel tank, it prevents the fuel pump drawing in air. Fuel strainers are provided at the bottom of the delivery module and at the inlet to the fuel pump.

Each fuel tank chamber has a fuel level sensor (lever sensor with potentiometer and sliding contact). The resistance values of both fuel level sensors are electrically switched in series (each 100 ohms).
Fuel tank full: approx. 0 ohm
Fuel tank empty: approx. 200 ohms