How is the pressure at the spigot(s)? How fast is the water coming out of the two tubes beneath your trailer? My guess is that you have the valve open at the water pump that draws water out of your fresh water tank when not using the city hookup (see if the valve is shut at the pump). The city water pressure is backfilling through your pump to the tank and filing it up to overflow capacity. This would likely result in reduced pressure at the spigot(s) with a constant flow from the overflow tube(s) coming from the fresh water tank below your trailer.
Let us know what you learn. Iron sharpens iron. We all learn here from each other that way.
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Jerry B.
"Stateboy" (Formerly "36fire412")
SW Lower Michigan
2016 X254
2012 Toyota Tundra Crewmax TRD 4x4
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