pull the fuel tank sender out so you can shine light into the tank(don't use a match for light
or you'll end up on the news). level the boat till you can see whats left in the tank. I have an electric fuel pump hooked up to a filter for just such an operation, but you can get some one to help you with a primer bulb and some hose, stick a short section of rigid pipe on the end(3/8 brake line works) so you can aim the end of the hose, try to suck out whats left in the tank with the primer bulb. Keep moving the trailer height to mmove teh gas around till you get most of it out. Top off teh tank with fresh fuel and install a water seprating fuel filter inline. Use the racor elements as they have a special coating to separate water from the fuel. You can buy racor elements to fit just about any aftermarket filter head(teh racor heads are expensive). Go ahead and replace teh fuel line to the engine, repalce teh primer bulbs(the Johsnon/evenrude are the best ones available) don't use the cheap bulbs or the cheap inline filters, they cause more problems than they fix. Do not use anything made by Moeller, its junk! If you want to get ahead of the game, go ahead and rebuild the carbs and be done with it.