Hi Jay,
Well, probably not. It would be unlikely in my opinion. The main thing (primary thing I should say) that will cause this is a faulty needle/seat and/or float. When the fuel level rises in the float bowl (exactly like a toilet bowl), the float comes up and pushes the needle against the seat (stopping the flow of fuel from the fuel pump). As Jerry said above, anything caught between the needle and seat will cause this condition. A broken (leaking) float will do the same. Or a float which is rubbing against the float bowl. I've seen some carbs where a clumsy person bent the float and caused it to hang against the side of the bowl. And believe it or don't this can happen sometimes and not at other times, all depending on a couple of factors. At any rate, Jay...your son is getting too much gas in the bowl and it appears nothing is stopping the flow. I think I'd take the carburetor off, drain it and then sit down and watch the float movement carefully to be sure there's room to move without striking the bowl. Next, check the floats to be sure there's no gas leaking in (shake gently and you'll feel/hear it). Then finally take a look at the needle and seat. See if it needs replacing or if anything is caught in there. Good luck!
