really dont know where this idea comes from.
as there is no one way valve on the bottle the filler hose is full of liquid propane during and after filling.....the one way valve is in the filler neck.
as the bottle empties, the liquid gas within the filler hose will vaporise if the filler is below the bottle.
Exactly :thumb:
Puddling? The whole line is full of liquid until it gets the chance to expand.
As for shutting off the valve when filling, I do it but I don't know why. Perhaps it's to ensure you not using anything gas while filling up. I can't see how any liquid would get into the low pressure side.