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Old 05-13-2024, 07:27 PM   #1
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City water fills fresh tank?

I hook up to city water and it fills my fresh water tank. Check valve, somewhere?
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Old 05-13-2024, 08:02 PM   #2
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Originally Posted by Nea1 View Post
I hook up to city water and it fills my fresh water tank. Check valve, somewhere?
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Yes usually in the water pump. You can try to run the pump to free it. Turn off / disconnect the city water first.


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Old 05-14-2024, 08:05 AM   #3
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Happened to me before. I looked and looked for an actual check valve, still haven’t found one.
Shut off your city water supply. Run your water pump for a few minutes with a faucet open to increase flow through the pump. That should help dislodge any grit or whatever from the pump diaphrams. The water is back flowing through the pump.
So, if your tank overflows, just shut off the city water and use your pump for a while.
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Old 05-14-2024, 08:37 AM   #4
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Shut off city water. Turn of any faucet to relieve pressure. Once water stops turn on water pump and run water for a few seconds. Shut off faucet. once water pump stops tuen ff water pump. Turn city water back on.
This should reset the check valve. Do not run water pump when connected to city water.

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Old 05-14-2024, 09:03 AM   #5
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You can also add an external check valve inline before or after the pump if the internal one won’t work
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Old 05-14-2024, 02:15 PM   #6
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So, now you know the check valve is part of the pump, and it is the likely culprit. And you have suggestions for clearing it.
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Point of information. If you regularly camp with hookups, exercise your water pump now and again. A common practice is to first sanitize the fresh tank and pump you can drink that water. Next, fill the fresh tank on site as a backup system in case the city water fails (many rural RV parks are on wells, and a full park can run a well "dry," or the pump can fail). And now the important part: 4 or 5 times a season, shut off the hose bib for the city water and turn on the pump and use it for a while to keep it healthy...and to know it's working if you need it...say for boondocking.

Once you pull out of the campsite, open the drain valve on the fresh tank so you aren't toting all that water about. Depending on your drain valve, the water will dump in a big gush (1 1/4" gate valve) or will piddle out slowly but resolutely (1/4" quarter-turn ball valve). Regardless, you'll want to empty away from a campsite and possibly while going down the road. Fresh tanks aren't always that well supported, so it's best to travel empty unless you are boondocking.

Finally, especially if you have a 1 1/4" gate valve dump on your fresh tank, close the valve as soon as the tank is drained so road schmoo and/or rodents don't end up inside your fresh tank. And close a small quarter-turn ball valve, too, so bugs and such don't take up residence in your fresh tank. A water source can be a powerful draw for many critters. But I digress. We were talking about pumps, weren't we?
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Old 05-14-2024, 02:24 PM   #7
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A simple thing to check also is your shower miser if you have one. If its turned on it will allow city water to fill your fresh water tank.
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