Fuel Level Sensor: Description and Operation

GF47.10-P-2010MIK Component Description Of Fuel Level Sensor
- MODEL 171.454 with ENGINE 272.942 as of Model Year 09 /AEJ 08 model refinement package
- MODEL 171.458 with ENGINE 272.969 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 at 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 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 sensor is sent to the rear SAM control unit with fuse and relay module (N10/2), which processes the voltage signal as required and sends it over the interior CAN (CAN B) to the instrument cluster (A1).