it has a leak. you should be able to leave it in the water. Here is what you do...take it out of the water. drain all water. Put the plugs in. Now..fill it with water up to the bottom of the engin and maybe higher. The only thin you dont want to happen is water to get into you carbs. You can go as high as the carbs. But you should start to be able to see well before that where it is leaking out. Once again fill it with water and watch where it leaks out and that will tell you what you need to know.
