I havn't had experience with the tractor you have but of all the others I've seen the systems work similar. Propane leaves tank as liquid at about 130psig on an 80f day. When liquid reaches vaporizor,the liquid is converted to vapor and sent to regulator at about 10psig. Some systems have the regulator between vaporizer and carb,others incorprate regulator into carb. Vapor is not under pressure as it leaves regulator. The vacum in carburator pulls and meters vapor acording to need of engine. So as you see no vapor should flow unless engine is running and is never at enough pressure(actualy none)to bubble liquid. I would say the regulator is malfunctioning in this case.
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