The float needle in the carb is either worn or sticking open allowing fuel to keep pouring into the float chamber. The pipe is an overflow. Sometimes a simple tap with a screwdriver can loosen a piece of dirt from the needle and it will work again. If not, take the carb off, remove the float bowl, pull the retaining pin and take out the float itself. The needle will then come out. Check the top tapered edge for signs of wear and if you find any then replace it with a new one. If not then spray the needle "socket" with carb cleaner, fit an in-line fuel filter and reassemble. Should now be operational again.
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