Turn off and disconnect the city water.
Turn on the water pump and run several gallons out of the tank.
Turn off the pump and reconnect the city water and turn it on.
Does the water start running out of the overflow again?
2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." 2014 19 days camping 2015 17 days camping201620 days camping