So, here's my two cents....because I saw it on the Internet...LOL!

Seriously, I have put Hundreds of Thousands of gallons of fuel (JET-A, JP-8, F34) into everything from generators, to helicopters (CH-46/47/53), to airplanes and jets (F-15/16/18, B-200/300/350, C-172/183)...you get the picture. In all those scenarios, the fuel system was grounded to the earth (via the tires and hoses touching the ground) and the receptacle was subsequently grounded to the fueling system (via the tires and grounding cables).

Not to mention thousands of hours conducting sling operations while both flying and serving as the load master beneath all sorts of Marine & Army helicopters...static discharge was a major danger there!

For the Internet junkies (admittedly, we can all be one at times)...There's a myth busters video on YouTube that addresses the cell phone concern at the pump. Sometimes they're goofy and you might wonder "why do people care about this particular myth?" But this one seems relevant. The long and short, after careful consideration and not-so-scientific research, is that it's is always a bonding/grounding issue. So, unless your plane is airborne (i.e. On jacks, specifically ones that have a non-conductive surface) and a person who's built up/carrying static electricity on their person, could somehow get a metal gas can to the fuel port without touching the ground or anything that's grounded out, then yes....a static discharge could ignite gasoline vapor.

Keep your wheels in contact with the ground (discharges static electricity), keep the fuel source in contact with a conductive surface that's touching the plane (Lowell's method looks good), and make sure your discharge all static electricity you might have generated when shuffling your feet on the shag carpet that we all line our hangar/garage floors with and you'll be fine. Like many have said, we use different methods to fuel different things (mowers, snow sleds, quads, etc.) but they all have one thing in common....they're all touching the ground!

Take it for what it's worth....