Re: 85hp Force with leak.
If it is coming from the top of the carbs, your needle valve is not shutting off the fuel. How hard are you squeezing the ball? Sometimes you can overpower the float when squeezing the primer ball.
You may also have varnish or gum buildup on the needle seats. In this case, it is better to take them apart and clean and rebuild them. In the future, run the carbs dry before storing the boat and use a stabilizer in your fuel as this will cut down on the deposits in the fuel system.
John