Fuel System, Filling/Bleeding

Special Tools And Workshop Equipment Required 

• Vehicle Diagnostic Tester

If fuel system components between the fuel tank and high pressure fuel pump are removed or replaced, then a fuel first filling must be performed.

Risk of Destroying the Fuel Pump

After procedures on the fuel system it is possible to damage the fuel pump by running it dry.

-- Never let the fuel pump run dry.

-- Fill or bleed the fuel pump.

To Fill the High Pressure Fuel Pump with Fuel, Proceed as Follows:

• Check the fuel gauge in the instrument cluster. The gas needle must not be in the reserve area.

-- Connect the Vehicle Diagnostic Tester.

-- Select Diagnostic  operating mode and Start Diagnostics  .

-- Select the Select Individual Test  tab and select the following tree structure consecutively:

• Drivetrain 
• Select The Engine Code And Engine 
• 01 - OBD-Capable Systems 
• 01 - Engine Electronics 
• 01 - Engine Electronics, Functions 
• Fuel Pump Activation 
• Press Preform The Test 
• Select 120 seconds.

-- The fuel pump must run for approximately three minutes to make sure the fuel system is sufficiently filled with fuel.

-- Start the engine after filling the fuel system.

-- Let the engine run for a few minutes at an average speed and then shut it off.

-- Check the fuel system for leaks.

-- Perform a road test and fully depress the accelerator pedal at least one time.

-- Check the high pressure system again for leaks.