Re: Spewing gas, help!
What kind of carb do you mean? Vent tube sounds like a CNS? The vent tube does need to vent on cns type, chinagirls vent through the 'tickle' button. No venting, I think, means the vapour can hold the float open. (gas expands)
Try with the vent tube open, go for a quick boot around the block, and double check its not still doing it.
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