My Honda 75 carbuerated 4 stroke does have carb drains which they advise draining if boat is idle for several weeks. In the real world however, what happens is a planned trip or two are delayed for various reasons and the next thing one knows several weeks have gone by. My concern, I guess, is fuel evaporating in the bowls and leaving residue. [non-ethanol]. The fuel bulb is easy to reach and in a couple seconds I can reach in and pump it up. Is there an advantage to doing that and keeping the carb bowls full?