Fuel Injection Throttle Body Assembly Having A Fuel Distribution Sleeve

A fuel injection throttle body assembly for an internal combustion engine and including a throttle body case defining a port. The fuel injection throttle body assembly further includes a fuel distribution sleeve disposed in the port and a throttle valve pivotably supported by the throttle body case and disposed in the port. The throttle valve is arranged between the fuel distribution sleeve and the outlet side of the throttle body case. The fuel distribution sleeve includes an annular body extending from a first sleeve end to a second sleeve end and has an inlet portion proximate the first sleeve end defining an inlet diameter, an outlet portion proximate the second sleeve end defining an outlet diameter, and a throat portion positioned between the inlet portion and the outlet portion defining a throat diameter, wherein the throat diameter is less than the inlet diameter and the outlet diameter.