GEAR-SPLITTER 3694925 - Caterpillar

The Electronic Control Module (ECM) detects a high temperature for the fuel supply. Information on default settings and ranges for this event code can be found in troubleshooting with an event code Troubleshooting, "Event Codes".System Response:The ECM logs the event code.Possible Performance Effect:E363(1)
Low powerTroubleshooting:A high fuel supply temperature can cause scuffing of the plunger inside the barrel of the injectors. This can lead to damaged injectors or failed injectors.If an E363 is logged repeatedly over a period of time, use the histogram data from Caterpillar Electronic Technician (ET) to determine the operating conditions during the logged codes. Check the engine speed, load, and coolant temperature during the events. This will help determine if the high fuel temperature is due to operation of the engine.Extreme ambient air temperature can contribute to heating the fuel that is inside the fuel tank. Determine the ambient temperature during the event. This can be compounded by a low fuel level in the tank. As unused fuel passes through the cylinder head, heat is collected by the fuel in order to cool the injectors. The unused fuel is returned to the tank. If the volume of fuel in the fuel tank is low, less fuel is available to absorb the heat from the return fuel.A restriction to the flow of fuel in the fuel return to the fuel tank may also cause a high fuel temperature.Test Step 1. Check the Operating Conditions of the Engine
Connect Cat ET to the service tool connector.
Turn the keyswitch to the ON position.
View the histogram data from Cat ET for the times during the occurrences of the events. Use the histogram data to determine if the operating conditions of the engine contributed to the high fuel temperature.Expected Result:The histogram data did not indicate that an operating condition contributed to the high fuel temperature.Results:Continue to the next test step.Test Step 2. Check the Fuel System's Components
Check for a restriction to the flow of return fuel to the fuel tank.
Check the condition of the lines for the fuel return from the engine to the tank. Check for lines that are collapsed or kinked. Check for deterioration and swelling of the fuel lines.
Verify that the pressure regulating valve in the fuel filter base is operating correctly. Check for damage or for dirt in the valve assembly. Expected Result:There is a problem in the pressure regulating valve, or in the return line to the fuel tank.Results:
OK - A problem was found in the pressure regulating valve or in the return line to the fuel tank.Repair: Make the necessary repairs. Verify that the repair eliminates the problem.Refer to Systems Operation/Testing and Adjusting for information that is related to testing the fuel system.STOP
Not OK - A mechanical problem has not been found with the fuel system.Repair: If an electrical problem with the temperature sensor circuit is suspected, refer to Troubleshooting, "Engine Pressure Sensor Open or Short Circuit - Test" for the correct troubleshooting procedure.STOP