Allthough I fly a differnt brand of turbines, I guess the problems are the same, and mostly the solutions are the same as well. If I experience a problem like this, I would check my fuel filter right away. Next think I would do is to check that the fuel can run freely throught the whole system. It could be anything from a stuck solenoid to a stuffed felt clunk in the fuel tank.

If the propane ignites and the fuel can run freely, the tubine will run if the fuel pump does.