My manual says the same thing although I've never tried it. In thinking about it, the pump has an inlet [from the fresh tank] and an outlet [to the trailer interior]. If the pump could "fill' the fresh tank from the city water inlet, seems like it would have to pump backwards through itself.
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2012 Eagle 320 RLDS
2017 Ford F-250 FX4 Crew STX 6.2l
3.73 E-locker
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