| Filling and bleeding fuel system |
Caution | If a fuel pump, fuel line (between fuel tank and high-pressure fuel pump) or fuel filter is removed or renewed, the fuel system must be bled before the engine is started for the first time. |
| After installation, the high-pressure pump must first be filled with fuel before the engine is started (the pump must NOT be allowed to run while still empty). |
|
Note | t
| When installing the high-pressure fuel pump, it is essential to ensure that no dirt enters the fuel system. |
| t
| Only remove sealing plugs immediately prior to installation of fuel lines. |
| t
| There must be sufficient fuel in the tank. |
| Proceed as follows to fill fuel system with fuel: |
| –
| Select „Engine electronics“ in vehicle self-diagnosis. |
| –
| Then select „Basic setting“. |
| –
| Select „Display group 35“. |
| –
| Press „activate“ button. |
| –
| The fuel pumps start running. |
| –
| The fuel pumps must run for approx. 1 minute to ensure that the high-pressure pump is filled with sufficient fuel. |
Note | To repeat basic setting, switch ignition off and on once. Then start basic setting again. |
| –
| Start engine after filling fuel system. |
| –
| Run engine at moderate speed for several minutes and then switch off. |
| –
| Check fuel system for leaks. |
| –
| Erase entry in event memory using diagnostic tester. |
| –
| After completing the repair, road-test the vehicle. Accelerate with full throttle at least once. Then check the high-pressure section of the fuel system again for leaks. |
Note | If there is any air left in the fuel system, the engine may switch to the backup mode ('emergency running' mode) during the road test. Switch off the engine and erase the event memory. Then continue the road test. |
| –
| Interrogate event memory. |
|
|
|
