Fuel Blowing Out Carb Vent Tubes Under Heavy Throttle: Expert Opinions Please

RustyRatRod said

Not but a few things that can cause this. Float level too high, too much fuel pressure, or dirty or defective needle and seat. That's about it.

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Don't forget you can get a bad float. Sometimes they have just enough bouyance to handle small needle and seat opening, but when the float drops under load it's too heavy and won't close the needle.

Other than that...that's about it.