Gas adaptor installed to an opening of a fuel tank of small engines equipments

Abstract

A gas adaptor installed to an opening of a fuel tank comprises an inner cylinder; a top of the inner cylinder being extended with a flange; an center of the inner cylinder having a fuel receiving hole; an outer cylinder extending from an outer edge of the flange of the inner cylinder; an inner wall of the outer cylinder being assemble to an opening of a fuel tank; a tube extending from one end of the flange; the tube being communicable to an EEC; a guide hole extending from one end of the flange and communicable to the tube; a sub-gas chamber being formed between the inner cylinder and the outer cylinder; the sub-gas chamber being communicable to the guide hole. The sub-gas chamber is communicable to an evaporative emission control system (EEC) through the guide hole and the tube.

1 . A gas adaptor installed to an opening of a fuel tank comprising: 
 an inner cylinder; a top of the inner cylinder being extended with a flange; an center of the inner cylinder having a fuel receiving hole; the fuel receiving hole being capable of being coupled with a cover of the fuel tank;    an outer cylinder extending from an outer edge of the flange of the inner cylinder; an inner wall of the outer cylinder being assemble to an opening of a fuel tank;    a tube extending from one end of the flange; the tube being communicable to an evaporative emission control system (EEC);    a guide hole extending from one end of the flange and communicable to the tube;    a sub-gas chamber being formed between the inner cylinder and the outer cylinder; the sub-gas chamber being communicable to the guide hole;    wherein the sub-gas chamber is communicable to an evaporative emission control system (EEC) through the guide hole and the tube.    
   
   
       2 . The gas adaptor installed to an opening of a fuel tank as claimed in  claim 1 , wherein a bottom of the inner cylinder is extended with a tube portion which is extended into the fuel tank for controlling a height of the fuel surface in the fuel tank.  
   
   
       3 . The gas adaptor installed to an opening of a fuel tank as claimed in  claim 2 , wherein an opening of the tube portion has a specific height to a top wall of the fuel tank; an outer wall of the tube portion and an inner wall of the fuel tank is formed with an expansion chamber; the expansion chamber is communicable to the sub-gas chamber.