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Make sure to check the entire water system before buying an RV. Fill the on board fresh water tank and check for leaks from the fill hose and tank. Close all the faucets and turn on the water pump. If the pump cycles after its initial run (it should run a little at first while it pressurizes the system) that indicates a leak in a supply line. Run every faucet one at a time to make sure there is adequate water delivery. Make sure to check that the showerhead shut off valve works. After you shut off the faucet, make sure the water pump stops. Check under the sink for any leaks in the drains. Fill the waste tanks and check for leaks. Dump the tanks and make sure that the valves work smoothly and that there are no leaks.