Cummins ISX11.9 CM2250 – Service Manual 019-115   Rail Fuel Pressure Sensor

The fuel pressure sensor is located on the fuel rail, mounted beneath the crankcase breather housing.

Before servicing any fuel system components (such as fuel lines, fuel pump, injectors, etc.), which would expose the fuel system or internal engine component to potential contaminants prior to disassembly, clean the fittings, mounting hardware, and the area around the component to be removed. Dirt or contaminants can be introduced into the fuel system and engine if the surrounding areas are not cleaned, resulting in damage to the fuel system and engine.

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.

Operate the engine and check for leaks.