YesI wasn't sure what the difference between the two levels was either, (using side or center stand to fuel up) but it seemed like a fair amount because I always fill up to the bar on the side stand and have noticed that the last fuel gauge "full" bar doesn't stay on very long afterwards.
I haven't seen the need to fill on the center stand where our tanks hold so much fuel and I didn't want to chance some fuel migrating to the charcoal cannister.
Can we safely fill the tank to the "bar" when on the center stand and not worry about fuel going to the charcoal cannister and drenching it?