Sorry for the new guy type question but I was wondering what is the differences between the 2nd gen engines verses the 3rd gen engines. Things like is there lift pump problems? What makes a HO verses an SO in 3rd gen. (a dealer just told me only a chip?) What injection pump do they use? I heard about the new fuel rail but I havent taken the time to find out how it really works. There just isnt much info out there yet on these truck. Unlike the 2nd gens limitless amounts of information sites. Thanks