PLUG-O-RING 9S8001 - Caterpillar

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 Caterpillar 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
E056(1) High Fuel Temperature Warning The fuel temperature is above the trip point for the specified delay time. The code is logged. Probable Causes
Fuel pressure regulating valve
Fuel level
Fuel lines
Overheated engineRecommended Actions
Table 2
Troubleshooting Test Steps Values Result
1. Fuel Pressure Regulating Valve
A. Inspect the return fuel pressure regulating valve for contamination.
B. Inspect the fuel pressure valve for damage.
Pressure regulating
valve
Result: The fuel pressure regulating valve contains contamination or debris.
Find the source of the contamination, and clean contamination or debris that can keep the regulating valve from opening properly.
Result: The fuel pressure regulating valve does NOT contain contamination or debris.
Result: The fuel pressure regulating valve is worn or damaged.
Make the necessary repairs to the fuel pressure regulating valve. Verify that the problem is resolved.
The fuel pressure regulating valve is NOT worn or damaged.
Proceed to Test Step 2.
2. Fuel Level
A. Ensure that the fuel tank contains enough fuel. As the fuel tank level decreases, the fuel temperature generally increases.
Fuel level
Result: The fuel tank level is OK.
Proceed to Test Step 3.
Result: The fuel tank level is NOT OK.
Add fuel, as necessary.
3. Fuel Lines
A. Inspect the fuel lines for obstructions.
Fuel lines
Result: The fuel lines are OK.
Result: The fuel lines are NOT OK.
Make the necessary repairs. Verify that the problem is resolved.
4. Overheated Engine
Air
Temperature
Result:
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.