DD15 Troubleshooting – Section 10.8 High Fuel Temperature Return

Section 10.8
High Fuel Temperature Return

Check as follows:‪

ENGINE EXHAUST ‪
To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪

1. Connect to DDDL 7.0 (the latest version).
2. Start and run the engine.
3. Check for a code that indicates high coolant temperature that could be a cause of high fuel temperature.
   1. If there is a code for high coolant temperature, refer to "11.1 Improper Engine Coolant Level" .
   2. If there is not a code for high coolant temperature, go to the next step.
4. Run the engine at idle with a no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range, 88-96°C (190-210°F).
   1. If the return fuel temperature is less than or equal to 60°C (140°F), check for improper injector calibration setting; refer to "9.4 Improper Injector Calibration Setting" .
   2. If the return fuel temperature is greater than 60°C (140°F), remove and replace the fuel filter; refer to the EPA07 DD15 Workshop Manual (DDC-SVC-MAN-0002), fuel system chapter.
5. Start and run the engine.
6. Run the engine through its operating range with no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range, 88-96°C (190-210°F).
   1. If the engine is not running rough or stalling, no further troubleshooting is required. Shut down the engine.
   2. If the engine is running rough or stalling, shut down the engine. Check for improper injector calibration setting; refer to "9.4 Improper Injector Calibration Setting" .