I always use the city water connection, and turn the switch to "fill" position. When water comes out the overflow/vent ,I know I'm plum full of water. Make sure to turn the switch back to "normal" position, if not the pump will cycle every couple of minutes or so, even when not running water.
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Darwin & Carla
2018.5 3701LK Montana
2022 3500HD Denali Duramax SRW
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