The tube with the arrow is one of the vents higher up on the carb. I think it's hard to get gas in that tube UNLESS the bike is layed over on that side. I've noticed a bit of gas in there when picking my bike up. It also seems to evaporate very slowly.
The bowl drain tube looped over the carb - any gas in it? That's the one that's more important. Fuel will drip out of that one, without tipping the bike, if the level in the bowl is too high.
'03 KTM 450EXC
"If you know what you're doing, then you aren't learning anything." - A. Lincoln