Private to feralfae, if you’re out there:
We got their batteries recharged and the engine block warmed up but the truck still wouldn’t start because he was unaware of this thing called winter formulation diesel. He filled the tank with fuel from the city down in the valley where it never gets cold and didn’t know the trouble he was making for himself and his wife.
I asked him about it first thing and he didn’t know the answer, so when the batteries were finally charged and the block heater was warm but the engine still wouldn’t start we took the Mr. Heater from their tent and put it under the fuel tank. That worked in much less time than I would have guessed.
They came to see the snow, and got rather a better look at it than intended. So they’re on their way back to civilization and I’m back where it’s warm.