Fuel Pressure Sensor/Switch: Service and Repair

Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement

Removal Procedure




1. Relieve the high side fuel system pressure. Refer to Fuel Pressure Relief.
2. Disconnect the engine wiring harness electrical connector (1) from the fuel injector wiring harness electrical connector.




3. Disconnect the fuel injector wiring harness electrical connector (1) from the fuel injection fuel rail fuel pressure sensor.





Important: Do NOT reposition the foam insulator as damage to the insulator may occur.

4. Insert a 27 mm socket through the opening in the foam insulator (2) onto the fuel injection fuel rail fuel pressure sensor (1).






Important: Applying force to the plastic housing of the sensor will destroy the sensor. To tighten or loosen, only apply force to the attached hexagon.

5. Remove and discard the fuel injection fuel rail fuel pressure sensor (1).

Installation Procedure

Important: Applying force to the plastic housing of the sensor will destroy the sensor. To tighten or loosen, only apply force to the attached hexagon.




1. Lubricate the NEW fuel injection fuel rail fuel pressure sensor threads with silicon free engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent.

Notice: Refer to Fastener Notice.

2. Install the NEW fuel injection fuel rail fuel pressure sensor (1).

Tighten the sensor to 33 N.m (25 lb ft).




3. Connect the fuel injector wiring harness electrical connector (1) to the fuel injection fuel rail fuel pressure sensor.




4. Connect the engine wiring harness electrical connector (1) to the fuel injector wiring harness electrical connector.
5. Install the low side fuel pressure service port cap.
6. Tighten the fuel fill cap.
7. Inspect for fuel leaks using the following procedure:

1. Turn ON the ignition, with the engine OFF for 2 seconds.
2. Turn OFF the ignition, for 10 seconds.
3. Turn ON the ignition, with the engine OFF.
4. Inspect for fuel leaks.

8. Install the intake manifold cover.