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I had the same problem with my heater I called the tech with buddy heater had to replace the pilot thermal couple and the main switch the tech said if I run it off a large tank I have to use a special hose the don't have any oils inside the hose from buddy heater I will see if I can get a part number and chime back in
they sell a filter that you can use your hose with,or buy the special hose and don't need the filter.