I have a livewell/washdown pump on my pontoon. it is mounted below floor towards back of pontoon. it is a "wash down" pump for marine use. However... when I turn it on it dosent come on. I can go under boat and tap it and it will work. turn switch off and back on it it dosent work again. one little tap and it's back on... Whats the deal? cant tap it when I'm out on the lake. just on trailer.