Abstract: A pulsation type diaphragm pump prevents back flow of a fuel and has reduced parts and assembly requirements. An intake valve disposed between an intake chamber and a pump chamber has an intake valve seat protruded to an inner portion of the pump chamber and an intake valve body formed by a portion of a pump diaphragm. The intake valve body opens and closes an intake valve seat port in cooperation with an intake seat surface in accordance with oscillation of the pump diaphragm. A discharge valve disposed between the pump chamber and a discharge chamber has a discharge valve seat protruded to an inner portion of the discharge chamber and a discharge valve body formed by a portion of a pulsator diaphragm. The discharge valve body opens and closes a discharge valve seat port in cooperation with a discharge seat surface in accordance with oscillation of the pulsator diaphragm.

Abstract: A carburetor for a general purpose engine is structured by a carburetor barrel body having an air horn which is made of metal so as to have an ensured mechanical strength, a constant level fuel bowl coupled to the carburetor barrel body, and a fuel trunk with fuel wells and passageways leading to the air horn from the wells which is made of synthetic resin separately from the carburetor barrel body and installed so as to extend into the fuel bowl from the carburetor barrel body. The carburetor prevents or significantly reduces evaporation of fuel in the wells during an engine stop and also prevents or significantly reduces evaporation of fuel introduced into the fuel bowl at an engine restart even if the fuel in the wells evaporates, with an effect of improving performance of restarting the engine at high temperatures.

Abstract: A dual carburetor, designed to simplify passage constructions of the main fuel system and the low-speed fuel system and to improve the productivity, production cost, quick response and reliability in fuel supply, includes main fuel passages (14) and low-speed fuel passages (19) extending vertically from a central portion of a fuel chamber (6) to the height of and between two air suction passages (2). Main nozzles (18) are connected to upper end portions of the main fuel passages (14), and the low-speed fuel passages (19) are bent at its upper end in horizontal directions to reach low-speed ports. Air bleed passages (24, 26) for respective fuel passages (14, 19) are formed to extend from near inlets of air suction passages (2) in horizontal directions to communicate with the fuel passages (14, 19), respectively.

Abstract: A carburetor assembly comprising an air intake tube having a venturi section therein, a hollow cylindrical body in which the air intake tube is inserted, a float chamber, a cover for the float chamber and a clamping device. These members are individually formed and assembled with each other. The assembled members are secured by means of the clamping device.