The griz has been sitting a few days so I went out to crank it up for a few minutes. I had the petcock off. Turned it on and walked away for 5 minutes. Came back and smelled gas. It's leaking gas out of the drain tube on very bottom of carb. Turned petcock off and started it for a few and it's stopped leaking. Turned petcock on and no leak. Any ideas what's up. Maybe from not running gas out of carb after turning petcock of from before?? Stuck needle? Any ideas??