High Pressure Pump

High Pressure Pump

Special tools, testers and auxiliary items required

• Torque wrench (5-50 Nm) (VAG 1331)

• Tool insert, AF 17 (VAG 1331/6)

• Socket insert AF 14 (VAG 1331/8)

Removing

• The following procedure represents the removal and installation of the left high pressure pump.

CAUTION!
• Fuel system is under high pressure! Before opening the high pressure components of the fuel injection system, the pressure must be relieved to a residual pressure. Refer to => [ High Side Fuel Pressure, Reducing ] Service Precautions.

• Then wrap a clean cloth around the connection and relieve the residual pressure by carefully loosening the connection.

• Observe safety precautions when disconnecting the battery.

- With the ignition switched off, disconnect the battery ground cable.

- Remove the rear engine cover.

- Disconnect the electrical connectors from the low fuel pressure sensor - 1 - and the fuel metering valve 2 - 2 -.





• The low fuel pressure sensor is located in the high pressure pump only through MY 2009.

- Remove both fuel line union nuts.

- Remove the bolts - 3 -.

• Do not change the angles of the high pressure lines.

- Carefully remove the high pressure pump.

- Remove the roller tappet from the cylinder head.

Installing

Installation is performed in the reverse order of removal, noting the following:

• Replace the O-ring.

- Install the roller tappet in the cylinder head.

- To set the high pressure pump in place, lift the high pressure lines only slightly.

- Install the high pressure pump in the cylinder head and tighten.

• High pressure line connections must not show any signs of damage.

• Do not change the angles of the high pressure lines.





- Hand tighten the union nuts for the high pressure lines.

- Make sure the high pressure lines are seated free of stress.

- To tighten the 14 mm diameter union nut on the high pressure line, use the (VAG 1331) with the (VAG 1331/8).

- To tighten the 17 mm diameter union nut on the high pressure line, use the (VAG 1331) with (VAG 1331/6).





- Tightening specifications, refer to => [ High Pressure Pump Assembly Overview ] High Pressure Pump Assembly Overview.

- Observe the safety precautions after connecting the battery.

- Connect the electrical connectors for the low fuel pressure sensor - 1 - and the fuel metering valve 2 - 2 -.





• Check the fuel system for leaks.