High Pressure Lines, Installing

Special tools and workshop equipment required 

• Torque Wrench 5-50 NmV.A.G 1331
• Ratchet, ReversibleV.A.G 1331/1
• Tool Insert, AF 17V.A.G 1331/6
• SocketT40055

Procedure

-- Remove any dirt from the sealing cone on the fuel rail.

-- Clean the fuel line and line connection with detergent and dry it with compressed air.

-- Coat the threads on the union nut with fuel.

-- Hand-tighten the union nuts for the high-pressure lines evenly, making sure they are seated without tension.

• Tightening specifications, refer to FUEL RAIL, HIGH PRESSURE LINES, FUEL INJECTORS OVERVIEW .

Union Nuts 17 mm Socket on Fuel Rail

Fig 1: Identifying SW 17 Union Nut At Fuel Rail, Torque Wrench V.A.G 1331 And SW 17 Socket V.A.G 1331/6

Courtesy of AUDI OF AMERICA, LLC

-- Use Torque Wrench 5-50 NmV.A.G 1331 with Tool Insert, AF 17V.A.G 1331/6 to tighten the high pressure lines.

Union Nuts 17 mm Socket on Fuel Injectors

Fig 2: Fastening High-Pressure Line At High Pressure Pump Using Torque Wrench V.A.G 1331 With Ratchet V.A.G 1331/1 And Socket 17 Mm T40055

Courtesy of AUDI OF AMERICA, LLC

-- To tighten the high pressure lines, use Torque Wrench 5-50 NmV.A.G 1331 with Ratchet, ReversibleV.A.G 1331/1 and SocketT40055.

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.

-- Turn off 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.

-- After the road test, check the DTC memory again.