Originally posted by Scruff
So the two water systems remain separate and the water doesn't mix?
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Sort of.. The two feeds don't mix, but within the camper, they become one, so to speak
. The pump feeds water to the system from the holding tank, if filled, and pump is on. City water connection feeds water to the system from the city water hook up. One way valves keep them separate. Occasionally the one way valves may stick. Usually it's the one at the pump, which will cause the city water to fill the FW holding tank, and overflow it out the fill tube. If you or friend experience this, disconnect from city water, turn on the pump, open a faucet and cycle the pump a few times. 99.999% of the time, this will seat the valve correctly.