DrewE had it right.
DrewE wrote:
The reasoning is that you don't want open flames or sparks. Simply turning the gas off without turning the appliances off will make the flames burn out (eventually), but then the appliances with automatic ignition will attempt to relight and produce lots of sparks, which is exactly what you are trying to avoid.
It's not the propane that is the problem, it is the flame and sparking ignition from propane operated appliances which might, though I'll admit it's probably a VERY slight chance, ignite the gasoline vapors.
If you're surrounded by diesel pumps, then no problem at all.
Yes, I DO shut off our refrigerator (and furnace if it's running) when refueling, as well as the generator. But we've got a gas rig and I do it mostly 'cause I don't have any control over what other folks might do while they're refueling. I don't want to be caught up in their "Hey watch this...." YouTube video. :)
~Rick
