Low pressure fuel and air charge forming device for a combustion engine

A throttle body assembly for a combustion engine, comprising:

• a throttle body having a pressure chamber in which a supply of liquid fuel is received, and a throttle bore with an inlet through which air is received;
• a throttle valve carried by the throttle body with a valve head movable relative to the throttle bore to control fluid flow through the throttle bore;
• a metering valve coupled to the throttle body, the metering valve having a valve element that is movable between an open position wherein fuel from the pressure chamber may flow into the throttle bore and a closed position wherein fuel from the pressure chamber is prevented from flowing into the throttle bore through the metering valve;
• a boost venturi located in the throttle bore and having an inner passage that is open at both ends to the throttle bore, the boost venturi having an opening through which fuel flows into the inner passage when the valve element is in the open position, wherein fuel flows from the pressure chamber to the metering valve under the force of gravity or under a pressure of less than 6 psi;
• and
• a control module having a housing carried by the throttle body and having a circuit board and a controller carried by the housing, and wherein the metering valve is electrically actuated and is coupled to the controller, and wherein the circuit board includes at least part of an ignition control circuit that controls the generation and discharge of power for ignition events in the engine.