Abstract: A carburetor comprising a main body portion defining a carburetor mixing passage having an air intake side and an engine outlet side, a fuel pump, a throttle shutter mounted within the carburetor mixing passage between the air intake side and the engine outlet side. The carburetor has a metering chamber for supplying fuel from the fuel pump into the carburetor mixing passage via a main discharge port, the main discharge port opens into the carburetor mixing passage on the air intake side of the throttle shutter. A starting fuel supply passage extends from the pressure side of the fuel pump to the carburetor mixing passage. A means is provided for selectively opening and closing the starting fuel supply passage such that when the throttle is in a partially opened position and the starting fuel supply passage is open, the fuel pump causes fuel to be injected through the starting fuel supply passage into the carburetor mixing passage.