Carburator is over flowing

SOURCE: fuel pump and overflow

The problem is not so major. There are a couple of things you need to check.

1. Make sure you are not getting dirt in the system because it will cause the "needle and seat" to not seal properly when the float chambers are full.
2. Reset the float level. In time the "needle and seat" in the carbs wears and consequently you will need to reset the float level. You can contact me if you cannot find the float specs and I'll tell you how to do it without elaborate measuring equipment. It's sort of complicated to explain but easy to do.
3. Worse case scenario you will need to replace the "needle and seats" in the carbs. They come as a unit sold separately so you will need one for each carb.
4. You do NOT need to replace the carbs. DO NOT go buy a new set, you're wasting money. The fix is really quite simple and at a fraction of the cost if any.
   

SOURCE: carburator leaking gas out of over flow tube

Sounds like a stuck float. try gently tapping on side of carb near bottom where float assembly is located to see if it frees up if it doesn't you will need to remove and clean your carb and check your float adj.

SOURCE: fuel overflow from carburator

you have a stuck float in the carb.  However, the fuel valve should have stopped the fuel flow.  so you need to rebuild the carbs and replace the fuel valve.

SOURCE: getting gas in breather box/leaks out after shutdown.

I had the same issue, cleaned the gas tank, carbs removed, cleaned and tuned. It helped but still has a rough idle when cold, likely due to a tired float. Best to try cleaning everything first, I had to use a carb guy to get the carbs tuned right for $100 and he remarked on the float not fully functional but I got away with it for a couple seasons. Winterization is essential to keep gas from causing this problem again. Damn ethanol
Cat Scratch

SOURCE: gas running out rubber tube left side where the gas line tees

You have a stuck float, and need to pull the carb, and clean it out