C27 Engine for the AD55B Underground Articulated Truck Fuel Temperature Is High Caterpillar


Fuel Temperature Is High
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1.1. Probable Causes
2.1. Recommended Actions
3.2. Fuel Pressure Regulating Valve
4.2. Fuel Level
5.2. Fuel Lines
6.2. Overheated Engine

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 Code List" for information about event codes and the default trip points for these codes. You must access the monitoring system on AVSpare Electronic Technician (ET) in order to view the current trip points for these codes.

Table 1
Event Code    
Code and Description     Conditions which Generate this Code     System Response    
E363(1) High Fuel Supply Temperature     The fuel temperature is above the trip point temperature.     The code is logged. The diagnostic lamp is illuminated.    
E363(2) High Fuel Supply Temperature     The engine power is derated. The derate is 12.5 percent for every degree over the trip point. The maximum derate is 25 percent.
The code is logged. The diagnostic lamp is illuminated.
E363(3) High Fuel Supply Temperature     The engine is shut down.
The code is logged. The diagnostic lamp is illuminated.

Probable Causes

  • Fuel pressure regulating valve

  • Fuel level

  • Fuel lines

  • Overheated engine

Recommended Actions

Fuel Pressure Regulating Valve

An improperly operating fuel pressure regulating valve may cause high fuel temperature. If a problem is suspected, inspect the return fuel pressure regulating valve. Clean any contamination or debris that may keep the regulating valve from operating properly. If debris is present, find the source of the contamination. Replace the return fuel pressure regulating valve if the valve is worn or damaged.

Fuel Level

Ensure that the fuel tank contains enough fuel. As the fuel tank level decreases, the fuel temperature generally increases.

Fuel Lines

Restricted fuel return lines may produce very high fuel temperatures. Ensure that the fuel return flow to the fuel tank is not obstructed.

Overheated Engine

The fuel is supplied to the injectors through a passage in the cylinder head. Abnormally high ambient air temperature could cause the fuel temperature to reach the trip level. An overheated engine could cause the fuel temperature to reach the trip level.

Information System:

C27 Engine for the AD55B Underground Articulated Truck Electronic Service Tool Does Not Communicate
C27 Engine for the AD55B Underground Articulated Truck Fuel Filter Is Restricted
C27 Engine for the AD55B Underground Articulated Truck Exhaust Has Excessive White Smoke
C27 Engine for the AD55B Underground Articulated Truck Exhaust Has Excessive Black Smoke
C27 Engine for the AD55B Underground Articulated Truck Engine Stalls at Low RPM
C27 Engine for the AD55B Underground Articulated Truck Engine Overspeeds
C27 Engine for the AD55B Underground Articulated Truck Engine Has Mechanical Noise (Knock)
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