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In a breather system for a fuel tank having a tank body, a fuel supply port opened and closed by a fuel cap provided in a central portion of an upper wall of the tank body, wherein an upper end of a breather pipe is located to face a central portion of a fuel supply port. When the fuel supply port

In a breather system for a fuel tank having a tank body, a fuel supply port opened and closed by a fuel cap provided in a central portion of an upper wall of the tank body, wherein an upper end of a breather pipe is located to face a central portion of a fuel supply port. When the fuel supply port is closed by the fuel cap, a breather chamber is formed in the fuel cap and the breather chamber communicates with the breather pipe. Thus, when the fuel tank is inclined, fuel is prevented from entering the breather pipe, and the fuel supply port is not immersed in the fuel, thereby maintaining the sealability of the fuel supply port.

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What is claimed is: 1. A breather system for a fuel tank including a tank body, an air chamber in the upper portion of the tank body, a fuel supply port located in a central portion of the upper wall of the tank body for adding fuel into the fuel tank and a fuel cap for closing the fuel supply port

What is claimed is: 1. A breather system for a fuel tank including a tank body, an air chamber in the upper portion of the tank body, a fuel supply port located in a central portion of the upper wall of the tank body for adding fuel into the fuel tank and a fuel cap for closing the fuel supply port, the breather system comprising: a breather pipe mounted on the tank body wherein breathing action is performed through the breather pipe between the air chamber and the exterior of the fuel tank; and a breather chamber formed in the fuel cap wherein the breather chamber is in communication with said breather pipe. 2. A breather system for a fuel tank according to claim 1, wherein the breather pipe includes an open upper surface at the upper end of the breather pipe facing the fuel supply port, the breather system further including a cap seal capped on the upper end of the breather pipe for sealing the upper end of the breather pipe, and a ventilating hole in a side face of the cap seal for communicating between the breather pipe and the breather chamber. 3. A breather system for a fuel tank including a tank body, an air chamber in the upper portion of the tank body, a fuel supply port located in a central portion of the upper wall of the tank body for adding fuel into the fuel tank and a fuel cap for closing the fuel supply port, the breather system comprising: a breather pipe mounted on the tank body wherein breathing action is performed through the breather pipe between the air chamber and the exterior of the fuel tank; a breather chamber formed in the fuel cap wherein the breather chamber is in communication with said breather pipe; and a strainer suspended from a lower portion of the fuel supply port for filtering fuel flowing into the breather chamber to return the filtered fuel to the tank body, wherein an upper end portion of the breather pipe passes through the strainer into the breather chamber. 4. A breather system for a fuel tank including a tank body, an air chamber in the upper portion of the tank body, a fuel supply port located in a central portion of the upper wall of the tank body for adding fuel into the fuel tank and a fuel cap for closing the fuel supply port, the breather system comprising: a breather pipe mounted on the tank body wherein breathing action is performed through the breather pipe between the air chamber and the exterior of the fuel tank; a breather chamber formed in the fuel cap wherein the breather chamber is in communication with said breather pipe; and a strainer suspended from a lower portion of the fuel supply port for filtering fuel flowing into the breather chamber to return the filtered fuel to the tank body, wherein the breather pipe includes an open upper surface at an upper end of the breather pipe facing the fuel supply port, the breather system further including a cap seal capped on the upper end of the breather pipe for sealing the upper end of the breather pipe, and a ventilating hole in a side face of the cap seal for communicating between the breather pipe and the breather chamber, and wherein the upper end portion of the breather pipe passes through the strainer into the breather chamber. 5. A breather system for a fuel tank according to claims 1, 2, 3 or 4, wherein the lower end of the breather pipe extends through the bottom wall of the tank body to the exterior thereof for connection to a canister. 6. A breather system for a fuel tank according to claim 2, wherein through-holes are provided on the fuel cap at positions radially facing each other, said through-holes communicating an inside of the breather chamber with the air chamber.