| Filling, bleeding fuel system |
| Special tools and workshop equipment required |
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| Central diagnosis -VAS 505X- |
Caution | Risk of irreparable damage to high-pressure pump if allowed to run dry. |
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| The high-pressure pump must first be filled with fuel before the engine is started. The high-pressure pump must not be allowed to run while still empty. |
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| If components of the fuel system between the fuel tank and the high-pressure pump are removed or renewed, the fuel system must be bled. |
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| When installing the high-pressure fuel pump, it is essential to ensure that no dirt enters the fuel system. |
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| Remove the stopper just before the assembly of the fuel lines. |
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| Fuel must be present in the fuel tank of the vehicle. |
| Proceed as follows to fill high-pressure pump with fuel. |
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| Connecting the vehicle diagnostic, testing and information system -VAS 505X- |
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| Select the guided functions, „Engine electronics“. |
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| Then select „Engine electronics, Functions“. |
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| Select „Filling / bleeding the high-pressure pump and fuel system“ from the selection list. |
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| The fuel pumps start running. |
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| The high-pressure pumps must run in three phases of 60 seconds each for about 3 minutes to ensure that the high pressure pump is sufficiently filled with fuel. |
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| Start engine after filling fuel system. |
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| Run engine at moderate speed for several minutes and then switch off. |
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| Ensure that the fuel system is completely sealed. |
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| Delete the fault memory entry using the vehicle diagnostic, testing and information system -VAS 505X-. |
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| Then, road-test the vehicle for more than 20 km. Carry out an acceleration with full throttle at least once. Then check the high-pressure section 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 fault memory. Then continue road test. |
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