Two ways for city water to enter the fresh tank .
Defective fresh tank fill valve and the reverse flow valve in the 12 volt pump head.
Hight city pressure can cause either to fail .
Do you use a quality city water pressure regulator ?
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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