Why not have a second tank? Then if the first one is empty use the second and refill the first. That's pretty much guaranteed not to fail, unless you have som

Why not have a second tank? Then if the first one is empty use the second and refill the first. That's pretty much guaranteed not to fail, unless you have someone that doesn't fill the tank. But that's s different problem. That's what I do at home and it is only for the occasional grilling, not anything like "we can't eat / have heat unless this works"