When using the power fill, you are using the same hose that the pump draws water from the tank with. So, when pushing water into the tank with the Tank Fill valve in the tank fill position, you are depressurizing the water pump pressure switch by not having pressure and the pump runs trying to pump water. This is a drawing I made several years ago of the plumbing in our rig, and you can see when the water fill valve is switched from normally feeding water from the city source of the cold water system to the fill position, you are connecting city water directly towards the tank. The blue lines in the valves are normal flow.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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