High Pressure Pump

High Pressure Pump

Fuel system is under high pressure! Before opening the system, perform the procedure for releasing fuel pressure. Refer to => [ Before Opening High Pressure Fuel Injection System ] Service and Repair

For safety reasons, if the battery is not disconnected, fuse - SF 6 - from the Fuel Pump (FP) Control Module (J538) must be removed before opening fuel system. Otherwise, the fuel pump will be activated by the driver's door contact switch.





• The fuse is located in the fuse holder in the right of the luggage compartment.

• By removing fuse - SF 6 -, the voltage supply to terminal 30 for the Fuel Pump (FP) Control Module (J538) is interrupted.

• The removal and installation of the high-pressure fuel pump can only be performed on a cold engine.

• When installing the high-pressure fuel pump, make sure that no dirt enters the fuel system.

• Catch escaping fuel with a rag.

• The O-ring must always be replaced.

• The fuel return line banjo fitting must always be replaced.

• High-pressure fuel lines must always be fastened free of tension.

Removing

- Remove engine cover.

- Disconnect electrical connectors from Low Fuel Pressure Sensor (G410) - 1 - and Fuel Pressure Regulator Valve (N276) - 2 -.





- Open both fuel lines - 2 and 3 -.





- Remove 3 bolts - arrows -.





- Carefully pull out the high-pressure fuel pump. The sleeve may remain inserted in the cylinder head.

Installing

- Replace O-ring for the high-pressure pump.

- Carefully place high pressure pump with sleeve in opening in cylinder head (check sleeve for damage first).

- Tighten bolts by hand.

- Before installing the fuel lines, check the torque of the connections on the high-pressure pump.

• Fuel return line connections tightening specifications. Refer to => [ High Pressure Pump Assembly Overview ] High Pressure Pump Assembly Overview.

• Fuel supply line connections tightening specifications. Refer to => [ High Pressure Pump Assembly Overview ] High Pressure Pump Assembly Overview.

- Always tighten bolts alternating sides with the required torque.

• High Pressure Pump Tightening Specification. Refer to => [ High Pressure Pump Assembly Overview ] High Pressure Pump Assembly Overview.

- Firmly place fuel return line hose (with hose clamp) on connection. Align so it is free of stress.

- Tighten fuel supply line union nut by hand. Align so it is free of stress.

• Fuel supply line (union nut) tightening specifications. Refer to => [ High Pressure Pump Assembly Overview ] High Pressure Pump Assembly Overview

- Connect electrical connectors on Low Fuel Pressure Sensor (G410) and for Fuel Pressure Regulator Valve (N276).





- Re-insert fuse if it was removed.

• Check fuel system for leaks.