Patent ID: 7971606

Claim:
A fuel tank for a fuel cell comprising, a tank body for storing fuel, the tank body having a threaded wall defining a fuel discharge opening; a cap covering the fuel discharge opening and coupling the tank body with a transfer pipe for transferring fuel from the tank body through the fuel discharge opening, the cap comprising a threaded fixed outer cap screw-coupled to the threaded wall defining the fuel discharge opening such that there is a gap between the threaded fixed outer cap and the threaded wall, wherein the cap has a pin hole providing an open two-way air path between inside the tank body and outside the fuel tank for maintaining an inside air pressure applied to fuel stored in the tank body; a floater having a lower portion positionable in the fuel stored in the tank body and an upper portion exposed to air in the tank body; and an air pipe having a cap end and a fuel end, the cap end being connected to the pin hole and the fuel end being connected to the upper portion of the floater.