Fuel-air mixing apparatus for vehicles

A fuel-air mixing apparatus for an internal combustion engine providing for the initial mixing of fuel with an airflow with the mixture subsequently being discharged into an induction airflow whereat final mixing occurs to vaporize the fuel, said apparatus comprising,

• fuel metering means including a positionable core,
• air conduit means in communication with said metering means providing a heated airflow into which fuel is metered to accomplish first stage mixing, said conduit means in downstream communication at a remote point with an induction airflow to the engine,
• a nozzle arrangement discharging the fuel-air mixture into the induction airflow,
• fuel and air linkage including a fuel-air control lever operated by the vehicle driver via throttle linkage, fuel and air regulating components actuated by said control, said fuel regulating component operable during open throttle conditions to regulate said fuel metering means, said air regulating component associated with an induction regulation valve whereby actuation of the fuel-air control will simultaneously regulate both a metered flow of fuel into the heated airflow and the flow of induction air with second stage mixing occurring in the induction airflow,
• an idle assembly regulating said fuel metering means during both idling and other closed throttle conditions, said idle assembly comprising,
• an idle arm for actuation of said positionable core of the fuel metering means,
• combination solenoid and vacuum responsive means acting on said idle arm to sequentially position the core for regulating fuel discharge during engine starting and the subsequent engine idling,
• temperature responsive means modifying the action of said combination of said idle arm under different temperature conditions, and
• said vacuum responsive means operable under closed throttle, high intake manifold vacuum conditions occurring during vehicle deceleration to close said fuel metering means to affect fuel conservation.