I just use an "overflow catch bottle". I bought a small plastic bottle and drilled a hole in the cap so I could add a fitting for some fuel tube. Then when I fuel, I take the fuel (pressure) line off of the muffler and put it on the bottle.

Hit the pump switch and turn it off when you see fuel running into the bottle. i.e. tank full. No fuss, no muss, no mess. And then I can put the used fuel back in the can.

This would work the same with a fuel dot 3rd line or Kwik fill or whatever way you set it up.

Mike