The fuel temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the fuel temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
- Remove the fuel temperature sensor.
- Check the resistance of the fuel temperature sensor by immersing the sensor in hot water (or using a hot gun) and measuring the results.
- At 68°F, resistance should be 2.3 - 2.7 kohms.
- At 122°F, resistance should be 0.79 - 0.90 kohms.
- If neither of these results are found, replace the fuel tank temperature sensor