Patent ID: 6994103

Claim:
A fill-up control valve structure comprising a casing attached to a fuel tank, a float provided in a float chamber defined in said casing so as to cause an up-and-down movement, a valve body provided at an upper portion of said float, a ventilation passage communicating with a downstream side of said valve body, and at least one first ventilation hole opened at a lower part of said casing to connect the float chamber of the casing and an inside space of said fuel tank, wherein said first ventilation hole allows fuel to enter from the inside space of the fuel tank into said float chamber of the casing, said float rises upward when pushed by the fuel introduced into said float chamber via said first ventilation hole, at least one second ventilation hole is provided at an upper part of said casing to connect said float chamber of the casing and the inside space of said fuel tank, and a hole size of said second ventilation hole is smaller than that of said first ventilation hole, said casing has a common flange through which said casing is attached to said fuel tank, and a fuel pump unit is attached to said common flange.