C9.3 Engines for Caterpillar Built Machines Caterpillar

Fuel Temperature Is High

Usage:

System Operation Description:

Probable causes of high fuel temperature.

Associated codes
Fuel level in the tank
Restriction in the fuel lines
Fuel cooler (if equipped)
Fuel temperature sensor
Fuel return pressure regulator
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".

Note: Refer to Troubleshooting, "Cat ET Service Features" for information about service features.

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

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Table 2
Troubleshooting Test Steps	Values	Results
1. Determine the Code A. Establish communication between Cat^® Electronic Technician (ET) and the Electronic Control Module (ECM) . Refer to Troubleshooting, "Electronic Service Tools", if necessary. B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes. Check for active codes and check for logged codes on Cat ET. C. Check Cat ET for any associated codes that are listed in Table 3. Troubleshoot any active codes before continuing with this procedure.	Codes	Result: An associated code is active or logged. Repair: Troubleshoot any active codes before continuing with this procedure. STOP Result: An associated code is not active or logged. Proceed to Test Step 2.

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Table 3
Associated Diagnostic Trouble Codes
CDL Code	J1939 Code
E198	5580
E1218	94

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Table 4
Troubleshooting Test Steps	Values	Results
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. Repair: 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	g02041759
Fuel supply lines for inspection

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Illustration 2	g02163246
Cooling line from fuel high-pressure pump to injectors

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Illustration 3	g02041781
Fuel return line to be inspected

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Table 5
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 (if equipped) for dirt, debris, or damage. 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.	Fuel Supply Lines	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. Repair: Replace damaged fuel lines and/or fuel cooler. Remove dirt or debris from fuel cooler fins. Verify that the problem has been resolved. If the problem has not been resolved, proceed to Test Step 4.

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Illustration 4	g02338019
Fuel cooler

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Illustration 5	g03779833
(1) Fuel temperature sensor

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Table 6
Troubleshooting Test Steps	Values	Results
4. Replace the Temperature Sensor A. Replace fuel temperature sensor (1) . B. Check for active codes or logged codes.	Fuel Temperature Sensor	Result: A E363 code is active or logged. Proceed to Test Step 5. Result: A E363 code is not active or logged. Return the unit to service. STOP

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Illustration 6	g02041973
(2) Fuel return pressure regulator

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Table 7
Troubleshooting Test Steps	Values	Results
5. Replace the Fuel Return Pressure Regulator A. Replace the fuel return pressure regulator (2) . Verify that the problem has been resolved.	Fuel pressure regulator	Result: The problem has been resolved. Return the unit to service. STOP Result: The problem has not been resolved. Proceed to Test Step 6.
6. Perform a Fuel System Verification Test A. Perform a "Fuel System Verification Test" in Cat ET.	Fuel System Verification Test	Result: The "Fuel System Verification 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. STOP Result: The "Fuel System Verification Test" was successful. Return the unit to service.. STOP

Test Step 1.

Results:

The procedure corrected the issue. - STOP
The procedure did not correct the issue. -
Repair: Contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).
STOP