My experience has been that it takes longer as the temperature decreases, you probably just didn't wait long enough.
Have previously experienced an unwelcome fireball beneath the bbq before. Before the rise of OPD tanks, when we still used POL nose fittings without excess flow valves or any of that safety gear, I once had the fuel hose between the regulator and manifold develop a leak while grilling. Made a very inconveniently located fireball about knee height, that persisted until I shut off the tank while wearing gloves that I had nearby for dealing with hot plates.A couple of years ago someone living a half mile away had a gas bbq set up under a canopy off the back of his house (mistake number one). He lit the burner but something malfunctioned. The resulting fire nearly burned his legs off and did burn his house to the ground. Yes others here seem to have had good luck refilling these tanks but all it takes is ONE thing to go wrong ONE time and it's all over. It simply isn't worth the risk.
So you apparently think tractors ONLY GET REFUELED Out In The Field and Never by the House or Barn or Machine Shed ?The situation of a farmer out in an open field a long distance from anyone and anything is a lot different from a person in close proximity to a house and also in closer proximity to more spark sources. Also there's not much more he can do if the stupid tractor runs out of gas. I think the only reasonable thing he can do is to become double jointed and kick his own backside for buying a white elephant tractor that does not use diesel fuel.
p.s. Farmers are some of the greatest risk takers in our society, in any of a myriad of ways. Farmers provide us with what we arguably need more than anything, our meals. I have the greatest respect for our farmers and want to see them safe and happy.
Yep, thats exactly how it was done even as late as 1990's on our farm and I'm sure still is elsewhere. I think the tractor tank was around 80 gallon capacity and that is the only way we ever filled it. Now we had a helium plant nearby and propane was an unwanted byproduct. I remember it as cheap as 16 cents a gallon all through the 1960's. Not only that my dad once got a rebate check for having been overcharged for propane several years. Loss of a gallon or two of propane while filling was no big deal while maintaining pumping equipment would have been. I'm sure that would have been electric powered, sometimes miles from an electric service. Since I did most of the plowing I would fill them to nearly 100% if I immediately started again after filling otherwise to 80%, where the vent would start to spit liquid.s100, what do you think farmers should do to fill their tractors back in the 50's when they are 20 miles from town and it is 100 degrees out if they couldn't vent the tractor to fill it. The problem with city people is they have propane inside. Farmers should fill the tractors 80 or 85% but if they are going to farm, they will fill them 100% and get to farming. When my propane guy comes to fill our 500 gallon tank, I will have him fill our smaller bottles.