| 摘要 |
PURPOSE: A fuel filter is provided to sense a stay of water in a fuel filter housing and to discharge outside to improve convenience of a driver and to prevent damage of an engine. CONSTITUTION: A fuel filter(1) comprises; a housing(2), a fuel inflow pipe(3) engaging with an upper portion of the housing to inflow a fuel to inside a housing, an element(4) filtrating water and dust from the fuel, a fuel exhaust pipe connecting with the upper portion of the housing to guide the fuel, a cylindrical guider(6) opened upward/downward and established vertically to a center unit of the element inside, and a drain hole(7) formed on the housing by connecting to an open portion of a lower portion of the guider. The water filtrated by the element stays inside the housing and pushes a float(8) having a lower specific weight than the water to the upper side of the guider by raising a height of a surface inside of the guider due to increasing of volume of the water. A magnet(13) approaches a water level of an upper limit switch(14) and attracts a movable contact point to attach to a stationary contact point by a magnetic field. Thereby, the upper limit switch turns on and an electronic control unit inputs an on signal outputting a control signal to control an open actuation of a solenoid valve(21). The drain hole is opened by the actuation of the solenoid valve to discharge out the water stayed in a lower portion of the float through the drain hole.
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