Series 50 – Section 2.23 Fuel Pressure Sensor

Section 2.23
Fuel Pressure Sensor

The Fuel Pressure Sensor (FPS) is installed into the secondary fuel filter. See Figure "Engine Fuel Pressure Sensor" . The FPS is not used in all applications. The FPS sends an electrical signal to the ECM telling it what the engine fuel pressure is at any given speed.‪

Figure 1. Engine Fuel Pressure Sensor

On Series 50G engines with the high pressure fuel system the fuel pressure sensor is installed in a tee at the inlet to the low pressure regulator. See Figure "Fuel Pressure Sensor for Series 50G" .‪

1. Fuel Temperature Sensor‪	5. Air Inlet Elbow‪
2. PSV‪	6. Low Pressure Regulator‪
3. Fuel Mixer‪	7. Air Temperature Sensor‪
4. Throttle‪	8. Fuel Pressure Sensor‪
‪	9. Fuel Inlet Tee Fitting‪

Figure 2. Fuel Pressure Sensor for Series 50G

Section 2.23.1
Repair or Replacement of Fuel Pressure Sensor

The FPS is non-serviceable and should be replaced as a unit. No adjustment is required.‪

Section 2.23.2
Removal of Fuel Pressure Sensor

Remove the FPS as follows: ‪

1. Disengage the locking tang on the three-wire connector. Grasp the body of the connector and gently pull it free of the FPS.
2. Use the appropriate wrench on the hex end of the FPS to unscrew it from the filter.

Section 2.23.3
Installation of Fuel Pressure Sensor

Install the FPS as follows: ‪

Note: The FPS is an electrical device. Use care on installation.

1. Use Loctite Pipe Sealant with Teflon, J 26558-92 part of PT-7276 (or equivalent) on all but the first two threads of the FPS to prevent leaks.
2. Screw FPS into the filter head or regulator inlet tee.
3. Turn the ignition to the "ON" position. If any diagnostic code other than 25 is obtained, refer to the DDEC II Troubleshooting Guide , 6SE489, or DDEC  III/IV Single ECM Troubleshooting Guide, 6SE497.