P 3500 V8-6.5L DSL Turbo VIN F (1998)
Diesel Fuel Temperature / Fuel Pump Position Combination Sensor: Description and Operation
Optical/Fuel Temperature Sensor
The optical sensor sends what is called a high resolution signal and a pump cam signal to the PCM. There is a harness filter inline to the optical/fuel
temperature sensor which is used in order to filter the shared 5 volt reference signal.