Yep, if the handle is pulled out and you are taking on water you might want to back flush the valve. FWIW, the valve is a thin piece of rubber that can get damaged. I had similar problems only the livewell wouldnt stay full on the trailer. I was able to get a repair kit from the manufacturer. I believe BCB parts can get them also. Also, the valve doesnt cost that much to replace and is not a major chore to do.