This sounds like an ignition problem. A propane/air mixture ignites at a higher temp than a gasoline/air mixture. If that magneto has gotten a little weak or the points dirty and it's making a weak spark that could be your problem. Personally, I would lose the magneto and change to a battery ignition regardless. Another thing to try (as Nicholson suggested) is to take the intake pipe off the carb and squirt a little gasoline in and see if it hits.
The fuel filter probably needs to be changed but if you're getting anything through then it should be enough to start; you'll have plenty of pressure with a full tank.
The regulator and vaporizer are combined in one unit. Most M conversions copy what the factory did and to find service information look for a 400 or 450 service manual. The setup is the same.
On the tank, what you can't see is that there is a pipe welded on behind the liquid valve that goes to the bottom of the tank. The vapor valve has a pipe that goes to the top of the tank.
Could you post a photo showing the carb side of the tractor?
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