Fuel System, Leak Test

Fuel System, Leak Test


• Follow the safety precautions when working on the diesel direct injection system. Refer to => [ Safety Precautions ] Diesel Fuel Injection.

• Observe the rules for cleanliness. Refer to => [ Clean Working Conditions ] Diesel Fuel Injection.

Always follow these instructions before and during work.

Test Sequence:

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

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

- Check the entire fuel supply system for leaks.

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

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

• Observe safety precautions that apply to road tests. Refer to => [ If special testing
equipment is required during road test, note the following: ] Diesel Fuel Injection.

• 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 Diagnostic Trouble Code (DTC) entries. Refer to "Guided Functions" in the Parts Catalog.

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