Fuel Temperature Sensor: Description and Operation

Two different fuel temperature sensors are used One of the sensors is located inside of the Bosch VP44 fuel injection pump and is a non-serviceable part. The other fuel temperature sensor is located in the top of the fuel filter housing and is serviceable (serviceable if replacing the fuel heater).

The sensor located in the Bosch VP44 fuel injection pump is used to check fuel temperature within the injection pump and to set a Diagnostic Trouble Code (DTC) if a specific high fuel temperature has been reached. If high temperature has been reached, engine power will be de-rated by the Engine Control Module (ECM).

The sensor located in the top of the fuel filter housing is used to control the fuel heater element. Refer to Fuel Heater Description and Operation for additional information.