3100 HEUI Diesel Truck Engine Fuel Heater And Water Separator

(1) Fuel inlet. (2) Fuel filter. (3) Fuel outlet. (4) Base. (5) Heater. (6) Temperature sensor. (7) Drain valve.

Some engines may have a combination fuel heater and water separator. The fuel heater is controlled by a thermostat located in the base of the unit. The thermostat is preset to turn the heater ON when the fuel temperature is below 2°C (35°F) and OFF when the fuel temperature is 7°C (45°F).

Water that has been separated from the fuel can be drained from the unit by lifting up on the drain valve (7).

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