Patent ID: 8038027

Claim:
A fuel cap comprising: an outer cap as an outer envelope; an inner cap removably fitted in the outer cap through an opening of the outer cap; and a canister located in a space between the outer cap and the inner cap for adsorbing a vaporized fuel, the fuel cap closing a fuel filler port for feeding a fuel to a fuel tank, the canister adsorbing a vaporized fuel vaporized from the fuel in the fuel tank, at least one of the outer cap and the inner cap defining a communication hole communicating with the space and an exterior, the canister including a housing; and an adsorbent accommodated in the housing, the housing defining, on an end surface directed to the inner cap, an inlet for a vaporized fuel to flow into the inlet, the housing defining, on another end surface directed to an inner surface of the outer cap, an outlet for a gas, from which the vaporized fuel has been absorbed, to flow out of the outlet, said another end surface of the housing contacting said inner surface of the outer cap, said inner surface of the outer cap and said another end surface of the housing having a clearance securement member as a spacer interposed therebetween and located proximate to the outlet, the clearance securement member securing a clearance between said inner surface of the outer cap and said another end surface of the housing, said clearance connecting the outlet and the communication hole each other.