DRAINAGE SYSTEM OF FUEL FILTER AND OPERATING METHOD THEREOF, CAPABLE OF DRAINING WATER OF WATER RESERVOIR BY THE LOAD OF THE WATER BY INSTALLING WATER LOAD SENSOR TO THE LOWER PART OF THE WATER RESERVOIR

摘要

PURPOSE: A drainage system of a fuel filter and an operating method thereof are provided to automatically drain water of water reservoir by the load of the water by installing water load sensor to the lower part of the water reservoir. CONSTITUTION: A drainage system of a fuel filter comprises a drain valve(32) formed in the middle of a discharge port(31) for discharging water stored in a water reservoir(30); an actuator(40) of a pressure operation type by a diaphragm opened and shut by rotating the drain valve; a vacuum tank(50) providing vacuum pressure to an actuating chamber of the actuator; a solenoid valve(63) formed in the middle of a vacuum line(46) connecting the vacuum tank and the actuator to control interruption of the vacuum pressure; a load sensor(61) measuring the load of water given to the lower part of the water reservoir; and an ECU(Electronic Control Unit,60) controlling driving to open the solenoid valve for a predetermined time if the load of the water detected from the load sensor is a set value and the engine of a vehicle is turned off.