While talking with a boating buddy earlier today, he recounted a recent winterization incident that while surprising to him, is likely all too common. Last weekend, while he was  putting antifreeze into his fresh water system something seemed amiss; even after pouring two full gallons of antifreeze into the system, the pump would not prime. After consulting with his friend, he poured another gallon in, with the same result. Together, they discussed the possible causes: a bad pump, a plugged funnel, faulty vent, etc.. After a few minutes, my buddy decided to start at the source, the funnel and much [...]