As long as you have your ASME tank (not a DOT bottle) filled by a knowable person, they will open the bleeder screw before filling the tank. ASME tanks usually do not a over-fill protection device installed. Some gas will always escape from the bleeder screw and that is normal. When liquid starts to spit out of the bleeder, the tank is 85% full. That is as full as you need the tank, so as to allow for expansion. Person filling the tank should use the remote switch to turn off the fill pump and close the fill line before closing the bleeder screw.
The proper tank filling procedure is to turn off every propane device in the coach and to turn off the propane to the coach at the tank valve before refiling. Obviously, the generator and engine should not be running during the filling procedure. It is not uncommon to have to intercede at a campground, as some re-fillers are not properly trained.
After refueling I always that the bleeder screw is tightly closed and then the propane back on before latching the access door.
Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow