The main problem with ethanol and fuel injected boats is that ethanol is more volatile than gasoline, on on boats there is not a lot of air circulation directly around the engine, and the fuel rail collects heat and gets hot, and the ethanol in the gas evaporates, and is not pushed through the injectors, thereby creating vapor in the fuel rail. This can be observed by when it happens you can depress the shrader valve and get a gas instead of a liquid. Ethanol has little to do with extra condensation in gas.