Originally Posted by Jefff H

Good news, I just received a call from the dealership and my truck is ready to pick up.
They said that they were able to put five gallons of DEF in it and that it was working fine now. I assume it must have had some ice in the fill tube when I tried to fill it even though I did squeeze the fill tube along it's entire length and it felt unrestricted. Maybe an air bubble? Anyway, thanks for all the help and suggestions!