I would not try to start untill i had a mack mechanic check it out. Sounds like it has stuck a barrel and plunger while in full fuel position. It may not but if you dont know mack engines you dont want to learn on this one. Who ever starts it need a choke plat and intake off down to the metal side of the intake of the turbo.

Source: Ch 427 Black Smoke And Wont Shutdown

Hey thanks for the input I was kind of thinking along those lines, also, thinking it might be the rack in the injection pump sticking, was just curious if it has happened to anyone else , tks again