I agree with Nick.
Besides, are the bowls properly ventilated to the atmosphere?
If not, some air pressure may be developing inside, pushing fuel in the direction you have explained rather the overflow tube.
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Motofool
.................................Never ride faster than your guardian angel can fly
"Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí
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