when i was last running my revo with the picco .26 on it as i was refueling it while it was running i had quite a bit of smoke or steam coming from the fuel tank, i was wondering if this is a bad thing, good thing, or just a normal occurrence. I'm not gonna say it was a lot of smoke/ steam but i'm not gonna say it was a little bit, kind of an in between. Any info on this would be very helpful and informative. thank you in advance:\