Patent ID: 7273042

Claim:
A fuel vent valve formed at an upper portion of a fuel tank for permitting and cutting off communication between an inside and an outside of the fuel tank, comprising: a casing having a vent space for connecting the inside and outside of the fuel tank; a communication passage formed on an upper portion of the casing, wherein the communication passage communicates an inside of the vent space with an outside of the vent space; a valve device having a float, which is in the vent space and rises and falls in response to the fuel level in the fuel tank, wherein the valve device includes an upper valve member, which is allowed to move up and down above an upper portion of the float, and the upper valve member shuts and opens the communication passage, wherein the upper valve member shuts the communication passage when the fuel level reaches a certain level; a regulated passage formed by a breathing hole and the valve device, wherein the breathing hole connects the inside of the fuel tank with the communication passage, and wherein the regulated passage varies the flow resistance of fuel vapor between the fuel tank and the communication passage to reduce the fuel vapor flow to the outside of the fuel tank when the fuel level reaches a predetermined level; a supporting protrusion extended toward the vent space from the upper portion of the casing; a valve supporter formed at the lower end of the supporting protrusion; wherein the breathing hole is formed on the outer wall of the supporting protrusion, and the valve supporter supports the upper valve member; and a communication hole formed in the casing, wherein the communication hole communicates the fuel tank with the vent space.