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Re: Chev 454 Emission Sys gas leak.
Likely your carburetor float bowl is getting over filled with fuel. The excess fuel is running down the vent line and into the cannister.
The float may be adjusted too high, or the needle and seat is leaking, or the float itself is saturated with fuel and is starting to sink.
Either way, I would suggest a carb rebuild and a new float.
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