Most likely culprit is the check valve in the water pump. It may have trash or just sticky. Try this:
Turn off the city water, turn on the pump and run the water for about 5 minutes. This might clean/reseat the check valve. If it doesn’t work then the water pump needs repaired/replaced.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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