I may have been fed a line but it just seemed odd that one truck branded system was reportedly giving this problem and multiple failures, apparently the same info is floating around the internet so either its a growing story or somewhere has some real basis.
However I was doing a search and came up with many pickup truck owners and a few highway tractor owners that admitted they had poured DEF into the fuel and the horrors that followed. Ford due to their setup with the two fillers so close together seemed to be high on the list of being screwed up but of course that is owners making the mistakes and not the equipment in those cases. One pickup owner said his wife had filled up at a station and grabbed the DEF hose and it put in four liters until it shut off ... she had no clue what she had done, grabbed another nozzle and continued to fuel up the truck. Some reported that their insurance covered their own stupidity while other insurance companies didn't as warranty sure doesn't cover the idiot factor!. Definitely room for error though and my guess is that "city folk" are the brunt of the screw ups as some people can be so clueless as to what they even bought and are driving.