ARM AS 6J1345 - Caterpillar

Use this procedure in order to troubleshoot high fuel pressure. Use this procedure if the following event code is active. Refer to Troubleshooting, "Event Codes" for information about event codes and the default trip points for these codes. You must access the monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".
Table 1
Event Code    
Code and Description    Conditions which Generate this Code    System Response    
E096(1) High Fuel Pressure     The fuel pressure is above the programmed trip point for the specified delay time.     The code is logged.    
E096(2) High Fuel Pressure    
E096(3) High Fuel Pressure    Probable Causes
Fuel Pressure Regulator
Improperly operating fuel pressure regulatorFuel Lines
Restriction in fuel linesFuel Pressure Sensor
Proper operation of the fuel pressure sensor
Diagnostic codes for the fuel pressure sensorRecommended Actions
Improperly Operating Fuel Pressure Regulator
A improperly operating fuel pressure regulating valve may cause high fuel pressure. If a problem is suspected, inspect the return fuel pressure regulating valve. Clean any contamination or debris that may keep the regulating valve from operating properly. If debris is present, find the source of the contamination. Replace the return fuel pressure regulating valve if the valve is worn or damaged.Restriction in Fuel Lines
Inspect the lines to the electric fuel priming pump. Check the fuel lines for the following: kinked fuel suction line, collapsed lines and contamination. A restricted return fuel line can increase fuel pressure.Proper Operation of the Fuel Pressure Sensor
Start the engine. Run the engine at low idle. Use Cat ET to monitor the fuel pressure for the engine. Check the value of the fuel pressure while the engine is at low idle. Ensure that the value of the fuel pressure is reasonable.Diagnostic Codes for the Fuel Pressure Sensor
Check for active diagnostic codes for the fuel pressure sensor. If diagnostic codes for the fuel pressure sensor are logged or active, refer to Troubleshooting, "Sensor Signal (Analog, Active) - Test".