Fuel System, Filling/Bleeding
Follow the points below to avoid running the high pressure pump dry (very low tolerances) and to start the engine quickly after replacing the components:
- If fuel system components between the fuel tank and high pressure fuel pump are removed or replaced, then the fuel system must be filled/bleed before the first engine start.
Special Tools And Workshop Equipment Required
- Vehicle Diagnostic Tester
To Fill the High Pressure Fuel Pump with Fuel, Proceed as Follows:
- The fuel tank must be filled.
-- Connect the Vehicle Diagnostic Tester.
-- Turn on the ignition and select the following menu items on the Vehicle Diagnostic Tester:
- 01 - Engine electronics
- Guided functions
- Fuel pump activation (Repair Group 20)
- Fuel System, Bleeding
- The fuel pump starts.
- The fuel pump must run for approximately three minute to make sure the high pressure pump is sufficiently filled with fuel.
-- Start the engine after filling the fuel system.
-- Let the engine run a few minutes at a moderate speed and then turn it off.
-- Check the fuel system for leaks.
-- Erase the fault stored in the Diagnostic Trouble Code (DTC) memory using the Vehicle Diagnostic Tester.
-- Perform a road test and press the accelerator pedal all the way down at least one time.
-- Check the high voltage system 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.
-- Erase the fault stored in the DTC memory using the Vehicle Diagnostic Tester.