https://www.pressdemocrat.com/articl...iles-off-half/
This says a fuel transfer problem - seems like there was fuel, but some difficulty in accessing it.
It was reported to be inverted on the floats.
There must have been a wind towards the west - it took around an extra hour to get back and even that without making it all the way:
https://globe.adsbexchange.com/?icao...20&trackLabels