2-1/2 ton with Continental multi fuel not starting

[Dakota v]

2-1/2 ton with contenintal multi fuel with not start on its own can start with starting fluid and run fine after all new filters cleaned fuel lines new fuel pump in tank blew air lines out any ideas

 

[biscuitwhistler37]

Lots of ideas, but how viable are they? That's the question. Simple questions first, what is the air temp where you are, has fuel pressure been verified by gauge after the last fuel filter, and how long is it cranking before you let it stop?