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You will have shut off valves or caps on three (3) drain points under the RV. One is to drain the hot water, one for the cold water lines and the other is to drain the fresh water tank. At least once a year, add 1/4 cup of bleach to the fresh water tank and fill it up with fresh water. Then turn on the water pump and run water through each faucet (kitchen/bathroom/shower) for 3-4 minutes. This will sanitize all the lines and outlet fixtures.
Make sure that you hooked up to the right line. Sounds like you are filling the tank instead of pressuring the trailer pipes. Sometimes there is a valve you must close to keep the city water from entering the fresh water tank. If you have your manual, check to see if you did it right.
Typically, when your unit is winterized, the tanks and hot water are emptied; at least they should have been. What you need to do is connect a hose like you would to use fresh water and open the valve. Then go to reach faucet in your unit and open them, one at a time until the pink fluid goes clear and then wait another 10-15 seconds before closing. Once all faucets, shower and toilet have been purged of anti freeze, Make Sure the bypass on the hot water heater is opened to let water fill the tank before you turn on the power, for electric, to prevent burning up the heating element. Once all is done, you should be able to do the valve to have water directed into your fresh water tank. For future reference, the drain hose will be at a low point, under the belly with a valve. If the lever is online with the drain hose/tube, the line is open. Make sure the lever is perpendicular (90 degrees) to the line to be closed so you can fill the fresh water tank.
Other than a leaking 4 way selector valve the probable cause would be a leaking check valve in the pump.
On the RV the city water and discharge from the fresh water pump are tied together. When on city water the discharge of the pump will have city water pressure on it. If the internal check valve on the pump is leaking, water will flow through the pump backwards and into your fresh water tank.
Typically this requires ether replacing the pump or installing a secondary check valve between the fresh water tank and the pump suction.
If it is a big valve it is your sewer tank drain valve. There is two valves. One is the Black water drain and the other is the gray water drain. the black water drain comes from the toilet holding tank, and the gray water valve drains the shower and sink holding tank.
there is probably a stoppage in the relief opening. should be next to the potable water fill. are you trying to fill from the pressure inlet or potable fill inlet? if from the pressure inlet, there is a bypass valve by the fresh water tank to divert watr into it.
check for blockage in relief valve next to potable water fill. it has a little screen that allows air to flow out as water is going in..also if you are using pressurized side check the bypass valve by water tank.
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