white smoke on startup

Air in the fuel will cause white smoke, you might want to put a preasure guage in the system and see if the preasure holds, remove the return hose and see if it dribbles, if it does change the regulator facing up in the secondary fuel filter check the return line for air after start up the next day to be sure you got all the air out. Many people recommend changing both regulators in the filter head.
Just a thought!

 

It's probably #5 cyl. It runs the hottest, and warps the injector seat.

 

The reason that your o-rings are going bad, is because your injector seats are warped, allowing combustion gasses to get to the o-rings, causing premature failure. Contact me. I can repair your head on the truck.

 

Hmm, dunno what happened to my earlier response. Insert a stick magnet and draw out the broken piece.

 

No, The injector does not even touch the injector cup. It only seats in the head. Cat has no repair. They say, replace the head.

 

does your method also work on ser 60 detroits? I know of a few drivers who have white smoke on start up, but only in cold weather.

 

No, Detroit injectors seat in the injector tube. Detroit heads have to be removed to replace the tubes.