Fuel System, Performing Leak Test

Fuel System, Performing Leak Test

CAUTION!
• Follow the safety precautions when working on the diesel direct injection system. Refer to --> [ Safety Precautions ] .

• Observe rules for cleanliness. Refer to --> [ Clean Working Conditions ] .

Always follow these instructions before and during work.

Test Sequence

- Remove engine cover. Refer to --> [ Engine Cover ] .

- Let engine run a few minutes at idle without pressing the accelerator pedal and then stop the engine. The fuel system bleeds itself.

- Check entire fuel system for leaks.

If there are leaks despite correct tightening specifications, replace the affected component.

- Perform a road test where the accelerator pedal is pressed all the way down at least once. Then check the high pressure area again for leaks.

• Observe safety precautions that apply to road tests. Refer to --> [ Safety Precautions ] .

• If there is still air in the fuel system, the engine may switch to emergency mode during the road test. Stop the engine and erase all DTC entries.

- Install the engine cover. Refer to --> [ Engine Cover ] .