I have heard it is best to buy your propane close to where you are going to use it, geographically speaking. The closer to our southern border the higher the possibility that some of your LPG will contain butane. Not a problem until the temps start to approach freezing as butane remains a liquid (it's the gas vapor you burn), below 32 degrees. Was your last fill south and now trying to use it in the north? Try using the appliances in the warmth of midday or gently warm the propane tank. If that works you can use most of what's there and top it off locally. The other thing that can happen, but should correct itself, is opening the valve after a fill too fast, a slow 10 count is better, or it may freeze up preventing gas flow.
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