Sounds like you may have flooded the machine & flooded LP is a real bear to clear.

Install new spark plugs (warming them to the touch with a hand held torch can help) & turn off the LP tank & purge the fuel system. Then give her a little squirt of either & see if she fires. This may take a few tries depending on flooded she is.

If she doesn't fire, then a complete check of the ignition system & a compression check would be in order.