C13 Engines for Caterpillar Built Machines Caterpillar

Fuel Temperature Is High

Usage:

Use this procedure to troubleshoot high fuel temperature. Use this procedure if one of the codes in Table 1 is active.

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Table 1
Diagnostic Trouble Code
CDL Code and Description	Comments
E363 (1) Engine Fuel Temperature High - least severe (1)	The fuel temperature is above an acceptable level. If equipped, the action lamp will illuminate. The code is logged.
E363 (2) Engine Fuel Temperature High - moderate severity (2)	The fuel temperature is above an acceptable level. If equipped, the action lamp will illuminate. The code is logged. There may be a decrease in power.
E363 (3) Engine Fuel Temperature High - most severe (3)

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Table 2
Associated Codes
Suspect Parameter Number (SPN)
E1218

Probable Causes

Codes
Fuel level in the tank
Fuel temperature sensor
Fuel Cooler (if equipped)
Fuel return pressure regulator
Restriction in the fuel lines
Fuel injector

Recommended Actions

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Table 3
Troubleshooting Test Steps	Values	Results
1. Check for Codes A. Check for codes in Cat^® Electronic Technician (ET). B. Check Cat ET for any associated codes that are listed in Table 2. Troubleshoot any active codes before continuing with this procedure.	Codes	Result: A code is not present. Proceed to Test Step 2. Result: A code is present. Repair: Troubleshoot any active codes before continuing with this procedure. If the problem is not resolved, proceed to Test Step 2.
2. Check the Fuel Level in the Fuel Tank	Fuel level	Result: The fuel level is OK. Proceed to Test Step 3. Result: The fuel level is NOT OK. Repair: Fill the tank. If the problem is not resolved, proceed to Test Step 3.
3. Inspect the Fuel Supply Lines A. Visually inspect the fuel lines between the priming pump and the inlet to the cylinder head. Also, inspect the fuel cooler for dirt, debris, or damage, if equipped. Inspect the fuel return line from the head to the fuel tank. Inspect the lines for restrictions, pinching, and swelling. Refer to Systems Operation/Testing and Adjusting, "Fuel System - Inspect" for additional information. B. If equipped, Inspect the fuel cooler for dirt, debris, or damage.	Fuel supply lines	Result: The fuel lines and the cooler are OK. Proceed to Test Step 4. Result: The fuel lines and the cooler are NOT OK. Replace damaged fuel lines and/or fuel cooler (if equipped). Remove dirt or debris from fuel cooler fins (if equipped). Verify that the problem has been resolved. If the problem is not resolved, proceed to Test Step 4.
4. Replace the Fuel Temperature Sensor A. Check for active codes or logged codes.	Fuel temperature sensor	Result: An E363 code is active or logged. Proceed to Test Step 5. Result: An E363 code is not active or logged. Return the unit to service.
5. Replace the Fuel Return Pressure Regulator	Fuel Return pressure regulator	Result: The problem has been resolved. Return the unit to service. Result: The problem has not been resolved. Proceed to Test Step 6.
6. Perform a "Cylinder Cutout Test" in Cat ET	Cylinder Cutout Test	Result: The Cylinder Cutout Test was not successful. Repair: Replace the identified injectors. Verify that all trim files are installed into the ECM correctly. Refer to Troubleshooting, "Injector Trim File - Install". Repeat the "Fuel System Verification Test" after making the necessary repairs. Repeat the process until all the injectors are operating properly.

If the problem is not resolved, contact your Technical Communicator (TC). For further assistance, the TC can confer with the Dealer Solutions Network (DSN).