ROD 6S7049 - Caterpillar

Illustration 1 g02795303
Location of the low-pressure fuel temperature sensor in the primary fuel filter base
Use this procedure in order to troubleshoot high fuel temperature or use this procedure if one of the following event codes is active. Refer to Troubleshooting, "Event Codes" for information about event codes. Access the engine 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
CDL Code and Description Conditions which Generate this Code System Response
E363(1) High Fuel Supply Temperature The fuel temperature of the low-pressure fuel system is above the trip point for the programmed delay time. The code is logged.
E363(2) High Fuel Supply Temperature The code is logged.
Engine power will be derated. Probable Causes
Diagnostic codes and event codes
Fuel level
Fuel pressure regulating valve for the low-pressure fuel system
Fuel temperature sensorsRecommended Actions
Diagnostic Codes and Event Codes
Connect Cat (ET) to the service tool connector. Check for active diagnostic codes.Look for active and logged diagnostic codes that are related to the low-pressure fuel system. Use the appropriate circuit test to troubleshoot any active diagnostic codes before continuing.Fuel Level
Check the fuel level in the fuel tanks. Typically, as the level of the fuel in the tank decreases, the fuel temperature will increase.Fuel Pressure Regulating Valve for the Low-Pressure Fuel System
An improperly operating fuel pressure regulating valve may cause high fuel temperature. If a problem is suspected, inspect the regulating valve for contamination or debris. Clean any contamination or debris that may keep the valve from operating properly. If debris is present, locate the source of the contamination. If the return fuel pressure regulating valve is suspect of damage or failure, replace the valve assembly.Fuel Temperature Sensor
Use Cat ET to monitor the "Fuel Temperature" parameter. Ensure that the value for the parameter is reasonable. If the value of the parameter is suspect, check the actual temperature of the fuel using a thermometer. Troubleshoot the circuit, as necessary.