Does Rich mean too much fuel or too much air? And Lean vice versa too little fuel or too little air? I am confused on this one guy tells me this another guy tells me this and someone else has no idea. I always thought Rich meant too much fuel. Any closure on this would really help me out. Sorry for the stupid newbie type question.

 

When your rich on fuel, your lean on air, and when your rich on air, then your lean on fuel So you can run rich and lean at the same time

 

ignore that! :P widebodycrx had the easiest explanation.