8hp Briggs updraft carb leaking fuel while trying to start.

[DaveTN]

I've rebuilt this thing twice and it is clean with all new components. Needle and valve seat seal, all passages are open. once reinstalled, I turn the fuel on, takes some to fill the bowl and no more. If I let it sit overnight it won't leak a drop. As soon as I start turning it over the fuel starts to trickle out in a stream and stops a few seconds after I stop turning the engine over. It won't start, the plug stays dry so its not getting gas. If I can start it (spraying carb cleaner into the carb) it runs nice, WOT down to a even idle. This is driving me crazy!

Thought I'd chime in my 2 cents worth. I was thinking that maybe the float is set too high. As long as it sits there, it wouldn't leak out. But vibrate it, cranking it over would cause that over-full bowl to slosh about and thus the leak even if the needle is seated. Similar to turning a push mower over on its side and gas pouring out the carburetor. Try setting the float a little lower down so it will cut off sooner. You'll still have lots of gas, but the bowl won't be so full. Hope this helps.