My 04 Monaco Windsor fresh water tank is not getting water to the water pump. I always thought the water from the tank was gravity fed to the pump which is two bays away from the pump. For a long time while traveling I would get a vapor lock and would have to open a release valve and let a little water out of one of the lines to eliminate the vapor lock. Now I get no water at all although the tank is full. Is there a tube or hose inside the tank that might have fallen in? Is there a screen that could be plugged up? My neighbor and I put a new pump onto the line that come from the tank, but nothing. Any help on were to look for trouble shooting would be appreciated.