It sounds like the regulator has a stuck valve or ruptured diaphram or something. They are simple but there shouldn't be liquid getting to the carb.
Generally you start on vapor and once you have a little water heat you switch to liquid. Nothing is harmed by starting on liquid, but the regulator can literally freeze up due the latent heat of vaporization.
Running on vapor alone will not allow you to make full power because there's not enough volume of energy coming from the tank. Engines always run on a mixture of fuel vapor and air and starting on specifically on vapor makes operation easier in cold weather. In the hot Texas sun I can start and run on liquid with no problems.
The vapor valve has a tube that goes to the top of the tank and the liquid valve has a tube going to the bottom. Generally they are labeled. A photo could help as there's umpteen varieties of tank valve configurations.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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