High Pressure Fuel Pump Repair – BMW N20 Turbo 4 Cylinder Engine
Step 1 - Purchase Parts
High Pressure Fuel Pump
Once again...we are going to preach about purchasing cheap fuel pumps from Amazon and Ebay with manufacturer names you cannot even pronounce. Yea...you get our point. Only...and we mean only install a Genuine BMW factory high pressure fuel pump in your vehicle. Cheap pumps will fail, and can seriously damage your engine. This is the same factory high pressure fuel pump that would be installed at the dealership.
Pump Gasket
When installing a new high pressure fuel pump in your engine, always replace the profile gasket. This will ensure you are leak free after the repair.
Depth Gauge
Excellent automotive depth gauge for measuring smaller holes and slots. Hardened steel base.
Step 2 - Repair Procedure
Disconnect battery.
- You must disconnect the battery before starting this repair. Not disconnecting the battery may cause catastrophic damage to the engine.
- Remove right trim panel from side of trunk (1).
Tape a rag around the intelligent battery sensor in the next step to protect it from being damaged. A damaged IBS will cause error codes and electrical malfunctions!
- Disconnect the negative (1) terminal.
- WARNING. Take extreme care not to damage the intelligent battery sensor (2) attached to the negative cable.
You must remove the ignition coils before continuing with this repair!
Please see our article Ignition Coil Replacement - BMW N20 Turbo 4-Cylinder Engine for instructions on removing the ignition coils.
- Locate the fuel lines near the rear center of the engine.
- Loosen the external torx screws (1) and (2), then remove cable clip (3).
- Loosen the union nuts (1) on the high pressure fuel line.
- Unclip the high pressure fuel line from the bracket and remove from the vehicle.
- Remove the sound insulation (1) from the high pressure fuel pump 13518604229.
- Loosen union nut (2) and remove the fuel delivery line from the pump.
- Unplug the electrical connector (1) from the pump.
- Slowly remove the external torx mounting screws (2), being careful to alternate turns every 90 degrees until the pump is loose.
- Remove the high pressure fuel pump 13518604229 (3) from the engine.
- It is important that the high pressure fuel pump camshaft is at its lowest point before installing a new fuel pump. The easiest way to achieve this is with a simple depth gauge (see tool list above).
- Install the depth gauge into the high pressure pump cavity as shown in the image. The ruler must be positioned on top of the camshaft at the bottom of the cavity.
- Using a socket and long breaker bar, slowly turn the engine CLOCKWISE at the vibration damper until the high pressure pump camshaft has reached its lowest position.
- Install a new fuel pump gasket 11127588416.
- Install the new high pressure fuel pump 13518604229.
- Tighten the mounting bolts (arrows) in 90 degree increments until snug. Torque bolts to 12 Nm (8.8 ft-lb).
- Torque all fuel line union nuts to 30 Nm (22 ft-lb).