C15 and C18 Engines for Caterpillar Built Machines Caterpillar

Fuel Temperature Is High

Usage:

D9T NJH

The probable causes of high fuel temperature

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

Use this procedure in order to troubleshoot high fuel temperature. Use this procedure if one of the following event codes is active. Refer to Troubleshooting, "Event Codes" for information about event codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".

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Table 1
Diagnostic Trouble Code
CDL Code	J1939 Code	Code Description (code descriptions may vary)	Comments
E363 (1)	174-15	Engine Fuel Temperature 1 High	The fuel temperature is above an acceptable level. If equipped, the action lamp will illuminate. The code is logged.
E363 (2)	174-16	Engine Fuel Temperature 1 High 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)	174-0	Engine Fuel Temperature 1 High 3

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Table 2
Troubleshooting Test Steps	Values	Results
1. Determine the Code A. Check for active codes and check for logged codes on Caterpillar Electronic Technician (ET).	Diagnostic trouble code	Result: A code is active or logged. Troubleshoot any active codes before continuing with this procedure. Result: A code is not active or logged. Proceed to Test Step 2.
2. Check the Fuel Level in the Fuel Tank A. Check the fuel level in the fuel tank.	Fuel level	Result: The fuel level is acceptable. Proceed to Test Step 3. Result: The fuel level is not acceptable. Fill the tank. Verify that the problem has been resolved. If the problem has not been resolved, proceed to Test Step 3.

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Illustration 1	g02023433
Fuel supply lines

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Illustration 2	g02024502
Fuel return line

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Illustration 3	g02338176

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Table 3
Troubleshooting Test Steps	Values	Results
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. Inspect the fuel cooler for dirt, debris, or damage, if equipped.	Dirt and debris or damage	Result: The fuel lines and the cooler (if equipped) are OK. Proceed to Test Step 4. Result: The fuel lines and the cooler (if equipped) 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 Temperature Sensor A. Replace the fuel temperature sensor. B. Check for active codes or logged codes.	Active codes or logged codes	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.

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Illustration 4	g02024574
(1) Fuel return pressure regulator

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Table 4
Troubleshooting Test Steps	Values	Results
5. Fuel Return Pressure Regulator A. Replace the fuel return pressure regulator.	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 A. Perform a "Cylinder Cutout Test" in Cat ET.	Test was not successful	Result: The Cylinder Cutout Test was not successful. 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.

Complete the procedure in the order in which the steps are listed.

If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).