1. No post crash fire.
The Short(s) 330 (somewhat uniquely) carries all its fuel in the "hump" on top of the fuselage. Except, of course, the relatively small amount currently enroute to the engines through piping.
So unless the top of the fuselage was breached, there would not necessarily be much fuel released. Losing a wing might only release a relative dribble.
The only picture of the fuselage available so far is a tight crop that is a little difficult to interpret, but it appears the fuselage ended up on its left side, with the tail twisted the other way. The fuel tanks may well be intact.
Additionally, even if the tanks were breached in the tumble down the hillside, the ending position is down in a foggy, damp woods (from that same picture - drooping leaves heavy with moisture, plus NTSB mention that that site was "muddy" and "slippery"). There may have been no source of ignition remaining by the time any significant fuel spilled from the tanks.