Abstract: A carburettor for an internal combustion engine, which includes a duct connectable to a combustible charge inlet of the engine; a butterfly valve pivotally mounted within the duct and connectable to a throttle linkage of the engine to permit control of airflow through the duct; and a housing provided exteriorly of the duct, the housing having an inlet adapted for connection to a fuel source, an outlet passage leading into the duct, and at least one valve means intermediate the inlet connection and the outlet passage for regulating fuel flow into the duct.

Abstract: A carburettor for an internal combustion engine, which includes a duct connectable to a combustible charge inlet of the engine and having opposed internal wall portions which are parallel, a regulatable fuel inlet for feeding fuel into the duct, and a vacuum inducing vane within the duct and upstream of the fuel inlet, the vacuum inducing vane being biased towards a closed position to impede airflow through the duct and being displaceable against the bias by airflow through the duct, thereby, during operation, to create a negative pressure downstream of the vacuum inducing vane.

Abstract: A carburetor comprising a throttle valve operated control valve controlling the supply of fuel to an air valve operated control valve discharging directly into the carburetor air duct.