What causes fuel over-temperature on a CAT 320GX excavator?

[IamBruce_Driver]

Possible causes:

1. Restricted fuel return line - Fuel can't circulate back to the tank properly.
2. Faulty fuel temperature sensor - Could be giving a false high reading.
3. Fuel cooler problem - Cooler may be clogged or not working.
4. Injection pump overheating - High-pressure operation can heat fuel.
5. Blocked fuel filters - Restriction increases fuel temperature.
6. Electrical wiring issue - Sensor wiring may be faulty.
7. SCV installation issue - New SCV may need calibration or could be defective.

Has anyone encountered this before or knows what else could be causing it?

 

[James R.]

Use an infrared thermometer to check the temperature before and after the fuel cooler. If there isn't a significant drop, the cooler is your villain.