Do you have the valve near the water pump in the correct position? If not, it may possible that you are inadvertently backfilling into the fresh water tank. This would cause the excess to run out the overflow while the city water is on. Also, if this were the case, it would be a continual flow once it reached the point of hitting the overflow tube of your freshwater tank (at least until you had reason to shut off the city water connection and therefore, cause the flow to stop).
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Jerry B.
"Stateboy" (Formerly "36fire412")
SW Lower Michigan
2016 X254
2012 Toyota Tundra Crewmax TRD 4x4
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