This procedure applies to all engines equipped with Cummins®/Fieetguard® fuel heaters.
NOTE: The fuel heater is not controlled by the electronic control module (ECM}. A bimetallic strip acts as a thermostat.
Front Gear Train
The fuel heater will turn on below approximately 7°C [45° F] and turn off above approximately 24°C [75°F].
Rear Gear Train
The fuel heater will turn on below approximately 2°C [35.6°F] and turn off above approximately 24°C [75°F].
On a rear gear train engine, the fuel heater (ring type} is integrated into the remote mounted priming pump and is
installed on top of the fuel filter. The location of the priming pump/fuel filter will be determined by the OEM.
On a front gear train engine, the fuel heater (stick type) is integrated into the left side of the engine mounted fuel
filter head.
