Patent ID: 7771890

Claim:
A method of preventing leak of a liquid fuel from a fuel reservoir for a fuel cell, wherein the fuel reservoir is detachably connected with a fuel cell main body and is equipped with a fuel-storing vessel for storing a liquid fuel and a fuel discharge part; the fuel discharge part is equipped with a valve for sealing communication between the inside and the outside of the fuel-storing vessel; the inside of the fuel-storing vessel is communicated with the fuel cell main body by inserting a liquid fuel-supplying member into the valve, thereby forming a communication part that communicates the inside of the fuel-storing vessel with the fuel cell main body and through which the liquid fuel in the inside of the fuel-storing vessel is supplied to the fuel cell main body; the valve comprises an elastic material and has an elliptic form in a cross section; the communication part is a slit which is provided in a minor axis direction of the ellipse, wherein the valve is pressed into a circular vessel having a shorter diameter or an elliptic vessel having a shorter major axis than the major axis of its ellipse to compress its own major axis direction.