Patent ID: 8347913
Filing Date: 2013-01-08
Classification: F02M,Y10T

Abstract:
1. A combustible fuel piping system adapted for interconnecting a fuel tank and a carburetor, the fuel tank including a casing that defines an upper space and a lower space in fluid communication with each other, the lower space being adapted for storing combustible fuel, the upper space being adapted for accommodating air when the lower space stores the combustible fuel, said combustible fuel piping system comprising: a fuel-feeding pipe adapted for interconnecting the lower space of the fuel tank and the carburetor; a fuel-drawing pipe adapted for interconnecting the upper space of the fuel tank and the carburetor; a vent pipe adapted for fluid communication between the upper space and the exterior of the fuel tank; and a switch valve operable to obstruct fluid flow through at least one of said fuel-feeding pipe, said fuel-drawing pipe and said vent pipe, said switch valve being operable to switch between a fuel-feeding state and a fuel-drawing state; wherein, when said switch valve is in the fuel-feeding state, fluid flow through said fuel-drawing pipe is obstructed, fluid flow through said fuel-feeding pipe and said vent pipe is permitted, and the lower space and the carburetor are in fluid communication through said fuel-feeding pipe so as to feed the combustible fuel stored in the lower space to the carburetor; and wherein, when said switch valve is in the fuel-drawing state, fluid flow through said fuel-feeding pipe and said vent pipe is obstructed, fluid flow through said fuel-drawing pipe is permitted, and the upper space and the carburetor are in fluid communication through said fuel-drawing pipe so as to draw combustible fuel out of the carburetor by virtue of a pressure difference between the fuel tank and the carburetor.