Fuel level sensor 1 (left) and fuel level sensor 2 (right)
2 fuel level sensors are installed in the fuel tank, one in each half of the tank.
The fuel tank level is determined by the fuel level sensors and displayed on the instrument panel (KOMBI).
1 fuel level sensor consists of the following components:
- Potentiometer with sliding contacts and potentiometer tracks
- Lever arm
- Float.
Only fuel level sensor 2 (right) can be replaced. Fuel level sensor 2 (right) is installed in the right half of the fuel tank.
The fuel gauge in the instrument panel (KOMBI) displays the fuel tank level as of terminal 15 ON.
The Junction Box Electronics (JBE) provide the two fuel level sensors with electrical power. The junction box electronics (JBE) determine a resistance value via the voltage drop at the potentiometers (depending on the filling level) and transmit this to the instrument panel (KOMBI). The fuel tank level is determined in litres in the instrument panel (KOMBI) via a characteristic curve.
The joint of the fuel level sensors contains a potentiometer with sliding contacts and potentiometer tracks. The position of the float and therefore the lever arm changes depending on the fuel tank level. This means that a certain resistance value can be assigned to each angle.
The following graphic shows the fuel level sensors on the F10.
| Index | Explanation |
|---|---|
| 1 | six-pin plug connection |
| 2 | Service cap (with connections for components inside the fuel tank) |
| 3 | Fuel level sensor 2 (right) |
| 4 | Fuel level sensor 1 (left) |
| 5 | Float on lever arm fuel level sensor 1 (left) |
| 6 | Float on lever arm fuel level sensor 2 (right) |
The measuring range of the fuel level sensor from approx. 0 to 200 millimeters corresponds to, for example in a possible encoding variant, 75 litres (total fuel tank capacity, for example 82 litres).
| Index | Explanation |
|---|---|
| 1 | Measuring range of fuel level sensor |
| 2 | Fuel level characteristic curve |
| 3 | Resistance |