Fuel pressure regulator

Before any work on the injection system, use the diagnostic tool to check:

• that the injection rail is no longer under pressure,
• that the fuel temperature is not high.

• Always observe the safety and cleanliness instructions given in this document during every operation.
• Never loosen a high-pressure pipe connection while the engine is running.

• Use the special plug kit for the high-pressure injection circuit.
• Always replace any high-pressure pipe and the high-pressure pipe clips that were removed.

REMOVAL

• Disconnect the battery.
• Blow out the area to remove debris around the fuel pressure regulator.
• Disconnect the fuel pressure regulator connector.
• Clean the area with brake degreaser.
• Remove:

• the three fuel pressure regulator screws (1),
• the fuel pressure regulator by hand (do not use a tool as a lever).

INSTALLATION

• Clean the seating face of the fuel pressure regulator on the high-pressure pump, taking care not to introduce any debris.
• Wipe the seating face of the fuel pressure regulator on the high-pressure pump, taking care not to introduce any debris.
• Reconnect the battery.
• Flush the fuel pressure regulator housing in the high-pressure pump by switching the ignition on for a few seconds.
• Disconnect the battery.
• Prepare the new regulator:

• remove the protective cap,
• check the position of the seals,
• lubricate the O-rings with clean diesel.

Note: Lubrication is very important to prevent external leaks.

• Present the regulator with a slight turning movement.
• Push gently until fully seated.
• Pre-tighten the three new regulator screws to 0.3 daN.m.
• Tighten the three regulator screws (0.6 daN.m) to torque using a "low torque" torque wrench.
• Clean the area with cleaning wipes.
• Fit the fuel pressure regulator connector.

Connect the battery; carry out the necessary re-learns (see Electrical Equipment chapter).

• Switch on the ignition.
• Clear any fault indicated in the diagnostic tool if necessary.

Check for diesel leaks:

• run the engine at idle until the radiator fan starts,
• rev the engine several times with no load,
• carry out a road test,
• switch off the ignition,
• check that no diesel is leaking.