Hey i have a 2006 f550 6.0 zf6. Ive had it about 40k miles replacing things here and there but the truck has been stock its whole life. I recently had 2 injectors fail on the electric side and replaced all 8 with Napa injectors. I know i could have gotten injectors with a better name but i had to have the truck going the next day/that day and they where available. So its been fine for a few thousand miles. I purchased an sct tuner to try and get a mpg or two out of it with the tow tune. Plug it in drive it around block everything is ok. Next morning (this morning)leave for work get it warmed up than start getting into it more and it dies. Reload stock settings starts up and its blowing white smoke(4am hard to see in mirror) try to limp it home eventually its getting fluid in the cylinders and starter wont start it back up. Drag it home the last mile. So now if i get it started i have tons of white smoke, smells like fuel to me. Oil seems ok, coolant is bright and correct color no noticeable loss, pressures look good to me. Im going to pull the valve covers now and try to get my glowplugs out but that will be a fiasco in itself as the harness is broken in the holes. Any suggestions on testing as i dig through it? If it where coolant id have to think it would have a distinct smell it would be less likely to give a problem cranking over? Steady thick white smoke with fuel smell. Going to hope to find a loosened or broke hold down.