High Pressure Pump

High Pressure Pump


Fuel system is under pressure! Before opening high pressure components of the fuel injection system, pressure must be reduced to residual pressure.

• Releasing pressure in the high pressure side. Refer to => [ High Side Fuel Pressure, Releasing ] Service and Repair.

• The high pressure pump can only be removed and installed when the engine is cold.

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

• Catch leaking fuel with a cloth.

• Always replace the O-ring and the connection.

• Always install the high pressure fuel lines so that they are free of tension.

Removing

- Remove the engine cover. Refer to => [ Engine Cover ] Engine Cover.

- Disconnect the electrical connector - 2 - from the fuel pressure regulator valve (N276).






- Open both fuel lines - arrows -.






- Remove the 2 bolts - arrows -.






- Carefully pull the high pressure fuel pump out. The roller tappet may stay in the cylinder head.

Installing

• To insert the high pressure pump, the roller tappet must be at its lowest point.

• If the same or a used high pressure pump is installed, replace the fuel supply line connections (high pressure side). refer to the high pressure pump overview.

• Tightening specifications, refer to => [ High Pressure Pump with Fuel Pressure Regulator Valve Overview ] High Pressure Pump with Fuel Pressure Regulator Valve Overview.

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

- Insert the roller tappet in the vacuum pump after checking the tappet for damage.

- Rotate the crankshaft until the roller tappet is at the lowest point.

- Install the high pressure pump into the vacuum pump.

- Tighten the bolts by hand.

- Replace the connections on the high pressure pump.

- Tighten the bolts crosswise with the required torque.

- Tighten the fuel supply line union nut by hand, align it so there is no tension and then tighten it.

- Connect the electrical connector - 2 - to the fuel pressure regulator valve.






- If the fuse was pulled, insert it again.

• Check the fuel system for leaks.