bought a new to us r vision 25 ft class c , when i try to fill the fresh water tank, water comes from the underneath the coach . cant seem to find a valve open anywhere . as soon as you turn the pump on it runs , with all the faucets closed and water drip profusely from underneath , nothing seems to be wet inside the coach.upgrading from a bare bones camper with no water or plumbing, so i am an idiot, the hand book , was so vague it is absolutely no help. anyone, especially anyone withan rvision motorhome.please help. thanks for looking ol partbirddog 2003 rvison 25 ft 8.1 v/8 27k miles.