One of the biggest problems with the newer fuel systems. If you have tar in the vaporizer then you most likely have through the whole fuel system. It really is not a bad design for the fuel system but mostly due to cheap LP fuel being used. If you do not specify what type of LP fuel you are most likely getting what they commonly call farm grade which has a lot of impurities in it and is fine if you are using it for your grill or something like that but not good for the newer fuel systems.
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