Patent ID: 6941966

Claim:
An outflow-limiting device of a fuel comprising: a housing, which is fixed to an upper wall of the fuel tank and which has a communication opening in communication with a canister; a float valve, which is a single body that is received within the housing, floats on liquid fuel, and moves upward end downward in accordance with upward and downward movement of a liquid level of the liquid fuel to close and open the communication opening; a tubular member, which communicates with the housing and extends directly and straightly downward from the housing into an interior of the fuel tank, wherein an outer diameter of the tubular member is less than an inner diameter of the housing, and wherein a lower end opening is formed at a lower end of the tubular member directly below the housing; and a through hole of a predetermined diameter, wherein the through hole is located near an inner surface of the upper wall of the fuel tank, and the through hole permits an inside and outside of the housing to communicate with each other, and the diameter of the through hole is less than the diameter of the lower end opening, and wherein when the liquid level of the fuel in the fuel tank reaches the lower end opening of the tubular member, the pressure within the fuel tank increases, so that the tubular member permits filling-up of the fuel tank to be detected, and when the liquid level of the fuel rises beyond a predetermined normal level, the float valve closes the communication opening.