A gas fuel tank with an internal emission fuel system includes a fill-and-vent valve system inside the fuel tank that controls fuel vapor through an exterior carbon canister and prevents spit back. This inventive system prevents exposure of the carbon canister to liquid or fuel. The fill valve assembly has a nylon wedge float that causes the fuel fill nozzle to shut off once the liquid level seals the valve opening. The vent valve assembly also has a nylon wedge float that shuts off vapor once the liquid level seals the valve opening.
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