Ive been having trouble with propylene as many have. I have a bulk tank too, about a 30# one I believe, and it is DIRTY! I recently took the hose off, after reading about people draining out the oil that accumulates, and after only about 3 weeks of little use there was a large amount of residue dripping out! I'll have to give your theory a try and only turn on the valve slightly to see if that cures my ailes!
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