Blowing raw fuel out after cold start is the symptom for glow plugs
not working or not used on prechamber engines. No mystery why they
wouldn't start.

That said the NA 3.3 was too small for the fullsize truck-unless you
never need to go over 50 mph as was the case for some in-town
vocational trucks. Many medium duty straight trucks were sold with
four cylinder Cumminses and three or four cylinder Detroits which
wouldn't do 55 mph with a van body up through the late sixties or
early seventies. Many bread vans with gas engines wouldn't either. Had
they used the turbo engine performance would have bettered the /6
which admittedly isn't saying much...

Properly used these are remarkable powerplants, but they are 200
CID...not 400.