That vent must be at the lowest point of enclosure.
Don't know, it was too much of a hassle. Can't recall details, nobody nearby, overnight processes, and I think it only got you a couple more years. The tank is now too old to recert anyway, but its in like-new condition. Easiest thing is to refill, even if only to 80% capacity, from a 20lb tank (I swap these out at hardware store when he empty). I'm assuming the hose just needs to be dual ended but should have a shut off of some kind. Was hoping someone who does this could detail what they rigged up? Don't wan't guess when it come to gas!
a back issue of the Overland Journal covers how this is done. It also show how to
get tanks filled in other countries. I also have never had a propane station refuse to
fill a tank. They also never look at the cert date. But again I am not in california.
That is a visual inspection, proof pressure or volumetric is a bit more detailed.Every decent sized town has a walk in shop can do it, usually a $25 charge pick it up tomorrow.
Nice thing with the BBQ size, you just exchange for a new one, pay a few bucks more for the gas that one time.