OK...got a small sink in my gally with a little hand pump. It pumped more air than water, and took forever to prime. I got a new one at the RV store and it's a little better but still pumps a lot of air. The tank is full, and I can suck on the supply line and it seems to be without leaks. Shouldn't this thing pump a nice stream of water as the pump lever is on the pump stroke? Getting frustrated...Thanks