Fuel Level Sensor: Description and Operation

GF47.10-P-2010MOR Component Description For Fuel Level Sensor
- MODEL 230.4 with ENGINE 275.9 as of model year 2009 / AEJ 08 model refinement package





View of the luggage compartment (for combustion engine 275.954/81)
75 Fuel tank
B4 Fuel level sensor

Location
The fuel level indicator sensor is inserted into the top of the fuel tank.





View of the luggage compartment (for combustion engine 275.983 code (P99) Special model "AMG Black Series")
75 Fuel tank
B4 Fuel level sensor

Location
The fuel level sensor is located in the fuel tank at the front right on the fuel feed module.

Design
The fuel level sensor consists of:
- Lever
- Float
- Double potentiometer (two sliding contacts)

Both sliding contacts of the double potentiometer are switched in parallel.

Function
The float changes the position of the lever (with the double potentiometer) according to the fuel level. This cause the resistance value of the double potentiometer to change, thus affecting the output voltage, which is then used as a measurement of fuel level.

The voltage signal from the fuel level indicator sensor is sent to the rear SAM control unit (N10/8), which processes the signal as required and sends it over the interior CAN (CAN B) to the instrument cluster (A1).