Fuel System, Bleeding and Performing a Leak Test

WARNING: This page is about a different car, the 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

-- Let the engine run a few minutes at idle without pressing the accelerator pedal and then stop the engine.

NOTE:

The high pressure connections must not be opened; the fuel system bleeds itself.

-- Switch off the ignition.

-- Carefully check the entire fuel system and the six return line connections for leaks.

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.

NOTE:

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.

-- Check the DTC memory after the road test.