If you’re having some trouble with your boat not wanting to run after ½ tank or so. Try taking the tank off. Leave the pressure & fuel lines attached. Put it under water and plug one end with your finger & blow into the other. See if any bubbles come from some where. You might have a leak &the systems isn’t staying pressurized. Just a guess but try it. And check for loose exhaust pressure nipples
. Check the connection on the carb. Check if the carb is loose even.