Throttle body fuel injection system with improved fuel distribution and idle air control

The fuel injection system of claim 4 wherein said plurality of openings are defined by a plurality of axial grooves (144) formed in at least one of the group consisting of:

• the outer circumference of said insert;
• and
• the inner circumference of said outer housing;
• and
• wherein said fuel distribution ring further comprises a circumferential groove (146) formed in at least one of the group consisting of:
• the outer circumference of said insert;
• and
• the inner circumference of said outer housing,
• said circumferential groove fluidly connecting said plurality of axial grooves with a conduit (142) fluidly coupling said plurality of outlets to said fuel injector.

A fuel injection system (100) comprising:

• a throttle body assembly (102) defining an outlet side dimensioned to mount atop an intake manifold of an internal combustion engine;
• a bore (112) formed through said throttle body assembly, said bore defining an inlet and an outlet wherein said outlet is open at said outlet side;
• a throttle valve (118) disposed in said bore;
• a fuel injector (104) mounted to said throttle body assembly;
• a fuel distribution ring (140) disposed in said bore, said ring defining upper and lower ends and a circular wall with inner and outer circumferences therebetween;
• a plurality of openings (144) formed in said lower end of said fuel distribution ring in fluid communication with said fuel injector whereby fuel is injectable from said fuel injector into said bore through said plurality of openings at a first point upstream of said throttle valve;
• an idle air control passage (120) formed through said throttle body defining an outlet port (124) in fluid communication with said bore at said outlet side and an inlet port (121) in fluid communication with said bore at a second point that is downstream of said first point and upstream of said throttle valve;
• and
• an idle air control valve (128) disposed within said idle air control passage.