Fuel Tank, Filling With Fuel After Installing High Pressure Pump

WARNING: This page is about a different car, the 2015 Audi A7 Quattro and 2014 Audi A7 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Vehicle Diagnostic Tester

CAUTION:

Letting the high pressure pump run dry will damage it.

The high pressure pump must be filled with fuel after installing, but before the engine is started for the first time.

NOTE:

When installing, make sure that no dirt enters the fuel system.

Only remove the sealing plugs right before installing the fuel lines.

The fuel tank must be filled.

Procedure

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

-- Connect a Vehicle Diagnostic Tester.

-- Turn the ignition on.

-- Select "engine electronics" in On Board Diagnostics (OBD).

-- Select "Guided Functions".

-- Then select "Activate fuel pump".

-- Select "120 seconds".

-- The fuel pump starts.

-- Repeat the step.

-- The fuel pump must run for approximately four 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 RPM and then shut it off.

-- Check fuel system for leaks.

-- Erase the fault stored in the Diagnostic Trouble Code (DTC) memory using the Vehicle Diagnostic Tester.

-- 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 one more time.