City Water Fills Fresh Tank

JeffroNC · April 2021

On my 2019 TAB400 There must be a check valve between the city water plumbing and the fresh water tank. Mine is leaking slowly. When I am connected to city water, my fresh tank level goes up. Any ideas or a photo?

pthomas745 · April 2021

This thread has a discussion about a "sticky" check valve.

https://tab-rv.vanillacommunity.com/discussion/12636/check-intake-valve-for-city-water-sticking

That thread has this thread inside it, which breaks down the entire pump! And gives some help for a stuck valve.

https://tab-rv.vanillacommunity.com/discussion/6454/fresh-water-tank-mysteriously-filling-when-connected-to-city-water

pthomas745 · April 2021

And, one more about the check valve.

https://tab-rv.vanillacommunity.com/discussion/2756/no-water-help

ScottG · April 2021

I believe the water pump itself prevents city water from flowing into the fresh tank--either by an internal check valve, or just by the nature of the pump's mechanics.

Per pthomas745's second link above, it looks like it might be repairable.

Tampakayaker · April 2021

Mine was doing the same thing on a 320. It was missing the strainer and dirt got into the pump. I pulled the pump out and disassembled it. Was just a few screws. Pulled bits of plastic? out of the diaphragm. Put it back together and no more backflow. And I bought a strainer assembly

JeffroNC · April 2021

Thanks folks. Last night I discovered that it is leaking in both directions. The pump runs periodically when city water is disconnected. I’ll take it apart tomorrow.

City Water Fills Fresh Tank

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