The fuel temperature sensor (FTS, A) is located in the fuel-Inlet line to measure the fuel temperature. The FTS uses a thermistor whose resistance changes with the temperature. The electrical resistance of the FTS decreases as the fuel temperature increases, and increases as the fuel temperature decreases.The 5 V power source in the ECM is supplied to the FTS via a resistor in the ECM. That is, the resistor in the ECM and the thermistor in the FTS are connected in series. When the resistance value of the thermistor in FTS changes according to the fuel temperature, the signal voltage also changes. This information of fuel temperature is used in correcting fuel quantity.