I have a 2001 Prevost H345. This is a new problem because the water has always worked great until now. The water flows fine out of the faucets when the water hose is hooked up to running water. However, when the water hose is disconnected, the water quits flowing. This includes all water flow areas, i.e. sinks, shower, toilet. The water pump works, the water pump buttons are on, yet the water will not come out of the faucets. The water tank is full, yet no flow, unless the hose is hooked up to running water. Any thoughts for troubleshooting this situation would be greatly appreciated. Thank you and and have a wonderful day!