You probably have a real ASME propane tank and not a DOT certified propane cylinder. If it is an ASME certified tank; then, it never needs to be certified. If the tank is drained, then you can change it yourself or take the coach to a propane tank dealer and have them replace it. Finally you need to have it purged. That is: to add a couple oz of denatured ethyl alcohol and about 1 lb of propane and then vent it down to nearly empty. Purging is necessary as the pressure regulator can freeze under heavy propane usage if all the water vapor is not removed before filling. The air in the tank will not effect the propane system but the moisture in the air will.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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