Re: And I wondered why my boat ran like crap
If the fuel water seperator (yes, you have one) is full of water, it will allow water to get to the carb.
Those filters need replaced and CHECKED yearly to make sure you aren't getting water to your carb. Pull them off and pour the contents into a clear container, and look for water. It will be a layer under the gas. Water causes corrosion on aluminum parts (carbs are aluminum).
Take the top of the carb. Proof will be there