Tightening Specifications

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.

Refer to OVERVIEW - FUEL INJECTORS .

Union Nuts 17 mm Socket on Fuel Rail:

Courtesy of AUDI OF AMERICA, LLC

-- To tighten the high pressure lines, use the Torque Wrench 1331 5-50Nm :VAG1331 with Torque Wrench 1331 Insert - Open Jaw - 17mm :VAG1331/6 .

17 mm Union Nuts on Fuel Injectors

Courtesy of AUDI OF AMERICA, LLC

-- To tighten the fuel injection lines, use the Torque Wrench 1331 5-50Nm :VAG1331 with Torque Wrench 1331 Insert - Reversible Ratchet :VAG1331/1 and Union Nut Socket :T40055 .

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.

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 Diagnostic Trouble Code (DTC) memory. Then continue the road test.

-- Check the DTC memory after the road test.