Welcome!!!Good choice on crotch rockets!THE BEST,Anyway...you should NOT be getting ANY drippage from ANYTHING.PERIOD.Couple of questions then....1)are you filling the fuel tank past the filler neck?And if so,are you letting her sit in the Sun afterwards?This will cause an overfilled condition occasionally.Dangerous as well.2)You're seeing "oil" in the tube?Are you sure it's oil?(and how much?)Or just fuel sludging up in the line.Doesn't sound earthshaking,but you do need to get it corrected ASAP.Have them check the breather tube(or you can yourself).If that's obstructed,pinched or something,you could have a serious pressure problem starting to emerge.You don't want that my man.What happens when you open the fuel door to fill up?Anything strange,like vacuum pressure or anything?A slight "rush" of tank air is normal.Long as it's coming OUT of the tank,not going in.
Do you have a California Model?Could be you need to have the canister checked...make sure the lines are clear,not pinched at the tank/frame interface.Canister's got to be free of sludge as well.Hope ya get er sorted soon!Ride safe on yer Rocketship!