I own a 1980 Coachman Leprechaun Class C. I filled my fresh water tank and the RV sat in the drive for several hours without any water leaking. The first, and every time I used the water pump, I got water leaking out on the ground. I tried to trace the leak and it looked like it was running back down the water line from the pump to the tank. The leak stopped on it's own when the pressure was gone but started to leak again when I used the pump again. Any thoughts or suggestions would be very helpful. Also, how do I access the water tank in case I might have to do some plumbing? Where is it located? Thanks.