We have a 2014 30.1 with the same problem. I used one of the filler tubes and managed to get a few gallons in. I did blow out the screen next to the filler tube, that seemed to help with a few gallons.
Took it into Premier Motor Coach in Tucson and they had no problem filling it. Nothing helps you feel more like a fool than taking it in for service and they can't find a problem.
When we had trouble filing it the weather was very cold. The 2 times we were able to get a full tank was in Tucson when it was warm. Can't explain it.....
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