I just found/read this.
That is an excellent idea to keep your feet (and the heavy tank) on the ground while fueling.
Like someone else stated, probably a lot more people have near broke their necks from slipping and falling off precarious perches, while trying to balance a five- to seven-gallon can of fuel, than will ever be hurt building/using your invention.
A few points I will add to the discussion :
One could make this even more portable by employing a pump from a 3-gallon garden-spray to pressurize when no compressed air was available.
For that matter, the whole thing could be built from two or three of the sprays grafted together for increased capacity, and replacing the tiny hose ports with bigger fittings/hose.
I would add a GoldenRod water-separating filter/sediment-bowl ahead of the delivery hose.
Also, no mention was made of it that I read, but it is absolutely a must to have a couple of good water separating air cleaner/filter units for the compressed air to pass through before it charges/enters the fuel tank.
Compressed air, especially in the humid Eastern-central states, is about two thirds water as it comes out the hose; we don't want this in our injector-pump.
