Patent ID: 8366080
Filing Date: 2013-02-05
Classification: F02M

Abstract:
1. A fuel supply apparatus for an engine, having a carburetor provided with a pressure diaphragm partitioning a fuel chamber and a pressure chamber, for increasing an amount of fuel drawn from the fuel chamber by applying pressure to the pressure chamber, the engine fuel supply apparatus comprising: an insulator interposed between the carburetor and the engine, the insulator acting to block off heat from the engine and having an air-fuel mixture supply channel for feeding an air-fuel mixture mixed with the fuel in the carburetor to the engine; a fuel booster pump incorporated in the insulator, the fuel booster pump having a pump chamber for applying pressure to the pressure chamber, and a negative-pressure chamber disposed adjacent to the pump chamber via a negative-pressure diaphragm; a negative-pressure chamber channel formed in the insulator so as to provide communication between the negative-pressure chamber and the air-fuel mixture supply channel, the negative-pressure chamber channel introducing a portion of the air-fuel mixture from the air-fuel mixture supply channel into the negative-pressure chamber; and a pump chamber channel formed in the body of the carburetor so as to provide communication between the pump chamber and the pressure chamber, the pump chamber channel introducing air from the pump chamber into the pressure chamber.