There is a pipe going from the water tank to the pump.
There is a pipe going from the pump out into the fresh water system.
Install a tee in the pipe between the water tank and pump. Install a tee in any cold water pipe that is beyond the pump. Then add a new pipe between the two tees with and a valve (gate or ball valve) that will allow water to flow in between, bypassing the pump. When connected to city water, opening this one valve will fill the water tank. When that valve is closed the system will work like original.
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Alan
2014 Silverado LTZ 1500 Crew Cab 5.3L maximum trailering package
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