Fuel injection throttle body assembly having a fuel distribution sleeve

A fuel injection throttle body assembly for an internal combustion engine, the fuel injection throttle body assembly comprising:

• a throttle body case having an inlet side and an outlet side and defining a port having an inner surface extending from said inlet side to said outlet side, wherein said inlet side is configured to receive air and said outlet side is configured to be coupled to the internal combustion engine;
• a fuel distribution sleeve disposed in said port and comprising:
• an annular body extending from a first sleeve end to a second sleeve end and having an inlet portion proximate said first sleeve end defining an inlet diameter, and an outlet portion proximate said second sleeve end defining an outlet diameter, said annular body further having a throat portion positioned between said inlet portion and said outlet portion defining a throat diameter, wherein said throat diameter is less than said inlet diameter and said outlet diameter;
• and
• a plurality of fuel nozzles defined in said annular body and radially arranged proximate said second sleeve end;
• and
• a throttle valve pivotably supported by said throttle body case and disposed in said port, wherein a portion of said throttle valve is arranged between said fuel distribution sleeve and said outlet side of said throttle body case.