CM2150 Electronic Control System – 019-115   Rail Fuel Pressure Sensor

The fuel pressure sensor is located on the fuel rail mounted on the inlet manifold.

WARNING  ISB Engines: The fuel pump, high-pressure fuel lines, and fuel rail contain fuel under pressure sufficient to penetrate the skin and cause serious personal injury. Do not loosen any fittings while the engine is operating. Wait at least 10 minutes after shutting down the engine before loosening any fittings in the high-pressure fuel system to allow pressure to decrease to a lower level.

WARNING  ISC and ISL Engines: Normal engine operation creates highly pressurized fuel in the fuel line which will remain in the fuel line after engine shutdown. Never open the fuel system when the engine is operating. Before servicing the fuel system, always loosen the pump to rail fuel line at the rail to vent the pressure. Keep hands clear of the line when loosening. High pressure fuel spray can penetrate the skin, resulting in serious personal injury or death.

NOTE: The following rail fuel pressure relief steps apply
only to ISC and ISL engines. The ISB engine
only requires waiting for 10 minutes after shutting down the engine for the fuel pressure to decrease (the pump to rail line does
not need to be loosened.)

• Before servicing the fuel system, loosen the pump to rail line at the rail to vent the pressure.
• Keep hands clear of the line when loosening.
• Tighten the fuel rail nut.

NOTE: A machined slot in this fitting directs the fuel spray towards the engine block.

Clean the area around the fuel pressure sensor.

Disconnect the pressure sensor connector from the engine harness.

Remove the fuel pressure sensor.

Inspect the engine harness connector and the fuel pressure sensor for the following:

• Cracked or broken connector shell
• Missing or damaged connector seals
• Dirt, debris, or moisture in or on the connector pins
• Corroded, bent, broken, pushed back, or expanded pins.

Inspect the fuel pressure sensor for the following:

• Damaged seal surface in the rail
• Damaged seal surface on the sensor
• Thread damage.

Install a new fuel pressure sensor.

Connect the engine harness to the fuel pressure sensor.

Start the engine and check for leaks.