Fuel Level Sensor: Description and Operation

GF47.10-P-2010MLK Component Description Of Fuel Level Sensor
- MODEL 171.473 with ENGINE 113.989 as of Model Year 09 /AEJ 08 model refinement package





Sectional view of fuel tank
75 Fuel tank
B4 Fuel level sensor

Location
The fuel level indicator sensor is located on the side of 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) in line with the fuel level. This changes the resistance of the double potentiometer and therefore the output voltage, which can then be used as a measurement of fuel level.

The voltage signal from the fuel level indicator sensor is sent to the rear SAM control unit with fuse and relay module (N10/2), which processes the signal as required and sends it over the interior CAN (CAN B) to the instrument cluster (A1).