Sea-foam is like gold in a can! I work for a marine repair shop and we use it religiously. I agree with sxr70001, it can work to an extent but if fuel has already started seperating in your carbs it wont do any good. I use it every time i fill up my boat, along with stabil ethanol treatment and have never had to physically pull off my carbs due to crud build up but i do take them off every spring to clean them anyways.