Fuel Supply Line: Service and Repair

High Pressure Fuel Lines, Installing

Special tools, testers and auxiliary items required

• Torque Wrench (5-50 Nm) (V.A.G 1331)

• Ratchet, Reversible (V.A.G 1331/1)

• Socket 14 mm (3150)

• Tool Insert AF 19 (V.A.G 1331/5)

• Socket (T40055)

Procedure

• When reusing the high pressure line, pay attention to the cylinder allocation.

• The high pressure lines can be reused only after the following checks:

• Check the sealing cone on each high pressure line for deformation and cracks.

• The bores for the lines must not be deformed, narrowed or damaged.

• Do not use corroded lines again.

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

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

- Lubricate the threads on the union fitting with fuel.

- Tighten the high pressure line union fittings by hand, making sure they are seated without tension.

• Tightening specification: 28 Nm

- To tighten the high pressure lines, use the following tools depending on the width across the flats:

Tightening the High Pressure Line to the Fuel Injector using a 14 mm Wrench





Tightening the High Pressure Line to the Fuel Injector using a 17 mm Wrench





Tightening the High Pressure Line to the Fuel Rail using a 19 mm Wrench





- Fuel system, performing a leak test. Refer to => [ Fuel System, Performing Leak Test ] Fuel System, Performing Leak Test.