Abstract: A fuel supplying device is provided with a supplemental fuel chamber such that there is no delay in the supply of fuel during high-speed operation. The fuel supplying device comprises: an outlet pipe in communication with a fuel injecting nozzle equipped in an intake manifold of an engine or an air intake passage of a carburetor; a pressing member configured to undergo reciprocating motion synchronized with the rotational period of an engine; a fuel chamber configure to supply fuel to an intake manifold of the engine from the fuel injecting nozzle through cooperation of the reciprocating motion of the pressing member, wherein the inlet check valve and the outlet check valve are configured to open and close alternatingly; and a fuel reservoir having a prescribed volume is connected and disposed upstream of the inlet check valve in the inlet pipe.

Abstract: Disclosed are example embodiments of a diaphragm carburetor. Example embodiments includes: a pressure regulator; a fuel chamber for storing fuel to be introduced into an intake channel; a diaphragm; an atmospheric-pressure chamber partitioned by the diaphragm 100; a fuel supply channel that feeds the fuel, a return channel that is connected to the fuel supply channel and returns excess fuel that is not introduced into the fuel chamber to a fuel-tank side. The fuel is supplied into the intake channel while being adjusted to a predetermined pressure by the pressure regulator. The diaphragm carburetor also includes an opening and closing mechanism that opens at engine startup to allow the fuel to pass through and closes during normal driving to prevent the fuel from passing through.