If it is leaking from the carb, you need to re-visit that repair. What parts did you replace, did you clean the rest of the fuel system and did you have questions of anything you've done so far?

I agree if you smell gas it is coming from a seaping fuel hose or a weak needle spring or seat? Or if may even be a hair line crack in the gas tank? I would replace any rubber fuel line if it has one. look at the fuel needle seat with a magnifing glass. If all is good then I would install inline fuel shut-off valve between the tank and the carb. Then you can cut the gas off to the carb. If you storying it in a garage connected to your house IMO its a safety item anyway Especially if you have any natural gas and pilots like a water heater????

See these two links below. Maybe you can answer my question at the last post.

http://forums2.gardenweb.com/forums/load/lmower/msg1119382820256.html?14

http://forums2.gardenweb.com/forums/load/lmower/msg110850154482.html?10