Fuel System, Bleeding and Performing a Leak Test
-- Let the engine run a few minutes at idle without pressing the accelerator pedal and then stop the engine.
The high pressure connections must not be opened; the fuel system bleeds itself.
-- Switch off ignition.
-- Carefully check the entire fuel system and the return line connections (6 in total) for leaks. The return lines and check valve must be replaced completely.
If there are leaks even though the correct tightening specification was used, 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.
If there is still air in the fuel system, the engine may switch to emergency mode during the road test. Turn off the engine and erase the DTC memory. Then continue the road test.
- Tightening specification. Refer to OVERVIEW - FUEL SYSTEM
-- After the road test, check the DTC memory again.