The freshwater pump in our RV (2007 Itasca Navion) stopped holding pressure - it would run up to pressure, stop, then cycle every 15-20 seconds (estimated; never timed on the old pump). Based on advi...
Make sure that both "low point" drain valves are shut off completely to allow water lines to pressurize fully. Otherwise pump will cycle on and off. Ours are hard to get at and hard to turn off completely.
