I am new to the RV world. Hubby and I bought a 2005 HiLo Silver at the end of last camping season and water was working fine then. We filled tank upon arrival at campground today, and hit switch for water pump but aren’t getting any flow. Crawled under sofa where fresh water tank is and flipped valves open and closed. Neither made a difference. Anyone have a suggestion or idea as to what the problem may be? Thanks!