What will cause my float bowls to go dry

Bewy said

The fuel cannot leak back to the tank via the pump because the fuel bowl vent prevents it; it acts like a siphon break.

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Yeah, so you say. I've seen it happen. It's a HUGE stretch to say that all the fuel in the carburetor, the line going to the pump and fuel in the pump is evaporating. I don't buy that.