Charlie was (to use a current term) my mentor in the LP business most of what I know about LP is because he taught me. Charlie said "Whenever a propane fueled engine starts acting up to rebuild the vaporizer. Even if that isn't the problem it will help." Most LP motor fuel systems work off a vacuum. The engine has to pull enough vacuum to actually draw the propane into the carb. Have you tried priming the carb? On the vaporizer there should be a button right in the middle like this IMPCO
It may have a solenoid over it like this Century
If no solenoid try this. Turn on the gas tank, push in the primer button until it gets hard to push, then try starting the engine. If it has a solenoid you'll have to find which switch activates it.You should be able to take 2 - 4 bolts out and remove it to see if it is working BUT IF YOU DO NOT KNOW LP SYSTEMS LET SOMEONE TRAINED OR EXPERIENCED DO IT. It isn't worth risking injury or explosion. It isn't rocket science but it is a hazardous material and can quickly injure you if you make a mistake. (photos borrowed from http://www3.shopping.com/xDN-building_supplies-propane_adapters)
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