K 1500 Suburban 4WD V8-6.5L DSL Turbo VIN F (1999)
Fuel Temperature Sensor: Description and Operation
Optical/Fuel Temperature Sensor
The fuel temperature sensor is a thermistor (a resistor which changes value based on temperature) mounted in the injection pump.
The fuel temperature sensor is part of the optical/fuel temperature sensor. The resulting voltage is monitored by the PCM which uses this signal to
minimize fueling error due to injection pump efficiency changes due to very hot fuel.
The fuel temperature sensor receives 5V from the PCM through the fuel temperature signal circuit. The fuel temperature sensor has a thermistor (a
resistor that changes based on temperature) that causes a voltage drop across the circuit. The PCM then interprets the amount of voltage on the circuit to
determine fuel temperature.
