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Scott:
Something to consider is using a water pressure regulator between the city water and the trailer input. The best ones are the adjustable ones with a gauge. There are two main manufacturers that I know of, Valterra and Camco. The Camco one is cheaper and available from Walmart online.
To answer one of your questions, there is a non return valve inside the water pump that stops the city water flowing backwards into the FW tank. This valve can get jammed by excessive city water pressure. That will show up as the pump not pumping water from the FW tank when dry camping. The fix is simple but involves some disassembly of the water pump.
I personally keep my water pressure regulator set for about 35 PSI so that it doesn't jam the pump's non return valve. Others on the forums say they keep theirs at 50 PSI. I had the NRV jam on my water pump even with a regulator in the line but with the regulator set for 45 PSI.
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