Alright im new to the whole diesel thing I just purchased a 99 7.3 and the problem I'm having is it smokes alot of white smoke and smells like raw diesel it starts perfectly it has a very slight miss at cold start then goes away it runs great no power loss at all I stuck it on my genysis and buzz tested injectors,koeo,koer. Everything checked out ok there's no check engine light on there's no codes.
There's no coolant in resivour, it's completly white smoke,never black,never blue,never grey always white and constant smell of raw fuel.
Like I sai I'm new to the diesel thing but ill do my best to answer any ???'su

 

My thoughts start at a head gasket, to a cracked something. I would pick up some dye and put into the water tank. Then with a black light at night. look for an external leak. The dye will react with the light and shine. This may give an idea of were a leak can be internally. Second. While the truck is running. I would think that you can do the same with the exhaust. If you see particulars that light up, then you have water leak. I know there is a dye for fuel as well.
My next thought would go to injectors. They may be fouling up somewhere.