Abstract: A carburetor for low pressure gaseous fuel comprising: a hollow body having a through bore, a venturi in said through bore, a throttle valve downstream of said venturi, a jet positioned in the venturi, said jet connected to a gaseous fuel supply, a flow control valve interposed between said jet and said fuel supply, said control valve being operatively connected to the throttle valve such that movement of the throttle valve causes translation of a valve element in a gas port whereby the area of the port is varied to regulate the flow of gaseous fuel to the jet in direct proportion to movement of the throttle valve.