Empy fuel tanks explode and full ones burn. The wings were punctured and ripped off but no fire occured. Pretty good evidence of bone dry tanks. If the tanks were in the wings on that trainer.
No gas tanks in the wing of a PT-22. The fuel is in a single tank in front of the cockpit. The pictures show the engine mounts broke just in front of the fuel tank.
Per wikipedia “The PT-22 fuel system consists of a single tank mounted forward of the front cockpit”