Float valve for fuel tank

A float valve for a fuel tank constructed and arranged to allow air in a fuel tank to be vented during refueling, said float valve comprising:

• a case disposed at an upper portion of a fuel tank about an opening into an air efflux channel, said case including at least a bottom wall and a side wall extending upwardly from a peripheral edge of said bottom wall and connected to said fuel tank, an air hole being formed in said side wall;
• a float member accommodated in said case, said float member including a float body, defining a sealed chamber, that generates buoyancy, said chamber being disposed at a position entirely above a center of said air hole, said float member including a skirt extending downwardly from said float body to a position lower than said air hole;
• a valve element disposed at an upper portion of said float, and being capable of closing said air efflux channel;
• and
• an auxiliary member disposed between said bottom wall and said float so as to assist in a valve-closing movement of said float,
• wherein said air hole is located at a position generally equal to where the fuel level exists for a full fuel tank.