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Old 06-04-2021, 04:32 PM   #1
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Brand: Thor Motor Coach
Model: Vegas 24.1
State: Indiana
Posts: 156
THOR #20004
Fresh tank overflow

Hooked to external water source. Water pump off. Fresh tank filled until overflowing. What’s happening here? Check valve somewhere? Where?
2015 Thor Vegas 24.1

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Old 06-04-2021, 05:26 PM   #2
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Brand: Thor Motor Coach
Model: 2013 ACE 30.1
State: Alberta
Posts: 1,410
THOR #2631
There is a one way check valve in the water pump that is supposed to prevent any backflow from city water connected sources feeding back through the water pump and filling the fresh water tank. Typically it is caused from plastic bits or other small debris that may have lodged in the one way valve. Sometimes it can be cleared by removing the city water feed temporarily and then using the water pump again a few times to try to clear the debris. Then try city water feed again and monitor your fresh fill status again. The other options are repair/replace the valve in the pump (if possible) or you can install a stand alone check valve in series with the water pump, but that typically requires a little plumbing work etc. as a “bonus ? ”. Good luck.
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Old 06-04-2021, 05:49 PM   #3
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Brand: Thor Motor Coach
Model: Vegas 24.1
State: Indiana
Posts: 156
THOR #20004
Thanks javelin. I’ll check that out.
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