Fuel Supply System: Refuelling
The driver's desire to refuel is indicated by the refuelling button. The vehicle must be at rest.
The hybrid pressure refuelling electronic control unit receives the request from the refueling button and starts reducing the pressure in the pressurized fuel tank (via activating fuel tank isolation valve). The hybrid pressure refuelling electronic control unit gets the information about the pressure from the fuel pressure sensor.
If any fuel vapors are present, they are released into the atmosphere via the carbon canister and dust filter. After the pressure has been reduced, the fuel filler flap is unlocked by the filler flap actuator.
| Index | Explanation |
|---|---|
| 1 | Check Control message in the instrument panel |
| 2 | Refuelling is possible |
The driver simultaneously receives information about the tank readiness status in the instrument panel as well as the CID. Then the fuel filler flap and cap can be opened and refuelling can take place. The refuelling should take place within 10 to 15 minutes. A hall effect sensor detects when the fuel filler flap is closed after refuelling. After about 2 seconds, the hybrid pressure refuelling electronic control unit activates the actuator drive for locking the fuel filler flap. The fuel tank isolation valve is no longer activated (is closed) and the displays in the instrument panel and CID disappear. This concludes the refuelling process.
| Index | Explanation |
|---|---|
| 1 | Hybrid pressure refuelling electronic control unit (TFE) |
| 2 | Air filter of the combustion engine |
| 3 | Differentiated air intake system of the combustion engine |
| 4 | Fuel injectors |
| 5 | Digital motor electronics (DME) |
| 6 | Diagnostic Module for Tank Leaks (DMTL) |
| 7 | Dust filter |
| 8 | Fuel tank vent valve (TEV) |
| 9 | Carbon canister (AKF) |
| 10 | Tank isolation valve |
| 11 | Fuel filter |
| 12 | Fuel level sensor |
| 13 | Suction jet pump |
| 14 | Intake mesh filter |
| 15 | First filling valve |
| 16 | Non-return valve |
| 17 | Electric fuel pump (EKP) |
| 18 | Expansion line |
| 19 | Return pipe |
| 20 | Feed line |
| 21 | Suction jet pump |
| 22 | Fuel level sensor |
| 23 | Non-return valve |
| 24 | Fuel pressure sensor |
| 25 | Pressure regulator |
| 26 | Service vent valves |
| 27 | Feed line to the combustion engine |
| 28 | Central pressure-retaining valve (Z-DHV) |
| 29 | Purge air line |
| 30 | Fuel tank vent valve |
Compare the fuel supply systems from E71/N63 to E72. Note the differences.
Note the connections and functions of TFE.
Note the procedure for refuelling of E72.