Carburetor fuel flow control valve assembly

An electro-mechanical cartridge type fuel flow control valve assembly for attachment to the float bowl of a carburetor for projection of the valve portion thereof into the carburetor float bowl, comprising, in combination, a unitary assembly consisting of an outer housing having an upstanding fuel well open at the top to the fuel in the float bowl and having an opening adjacent its other lower end connected to the carburetor main fuel supply line for the flow of fuel therebetween at all times, a removable fuel metering flow control orifice means integral with the well between the openings, a fuel metering needle type valve mounted in the orifice means for an axial transitory movement relative thereto to selectively control fuel flow volume from the bowl to the main supply line, a reversible electrical stepper motor fixedly received in an integral manner within the housing and having a central core surrounding and threadedly engaging the needle valve for moving the valve axially in discrete steps as a function of electrical impulse input signals to the stepper motor rotating the motor, and electrical connection means to connect the stepper motor to a selectively operable, selective impulse type source of electrical energy.