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Old 01-04-2016, 09:55 PM   #1
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City water flowing into fresh water tank

We are connected to city water and for some reason the fresh water holding tank is filling and overflowing.
What could be the cause. Where is the pump located in a Sabre 34RCTS? Are diagrams of the plumbing available online?

We have currently turned off city water and using water pump and fw holding tank.

Thanks
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Old 01-04-2016, 10:00 PM   #2
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There is a backflow valve on your water pump that is probably stuck or gone bad. Also possible that your city water pressure is too high and pushing past the pump. Do you have a regulator on the city water line?
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Old 01-04-2016, 10:13 PM   #3
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Some units also have a valve that allows you to fill your fresh water tank while connected to city water. I don't know about the OP's particular unit but worth a look.
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Old 01-04-2016, 10:57 PM   #4
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Fairly common.

Do the following
Shut off city water
run water until stops
turn on water pump ( some water still in water tank)
run water for 30 sec.
turn off water
once pump stops turn off pump leave off ( do not use with city water)
turn on city water

This should re-seat /clean the check valve in the water pump.
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Old 01-04-2016, 11:17 PM   #5
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5picker nailed it. There is a selector valve that directs "Waterhose" water to either the fresh water tank or into the system plumbing. This valve is leaking. Turn the water off at the hose connection. Open a faucet to drop pressure. Cycle this valve several times. Sometimes 'o' ring seals can take a set and seep causing what you describe. Try it again. If that didn't work try this; If your valve can be disassembled, remove the spool and examine the o rings carefully. They may be old and dried out. Find a rubber and gasket shop. Take them the spool and they can sell you new o rings. I recommend viton as opposed to butyl. Coat them with a small amount of Vaseline and re assemble.
If the valve does not come apart, new ones are available on Amazon for about $95. At least that's what I recall the price being.
Good luck.
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Old 01-05-2016, 09:35 AM   #6
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Thanks everyone

Thanks for the replies. I do have a pressure regulator on that the faucet. I will try all of your suggestions...ok, my husband will!!

I'm not sure if this makes any difference but there are separate connections for city water and filling the holding tank.

Thanks again for such quick responses...really want to get this working correctly!
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Old 01-05-2016, 11:01 AM   #7
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Quote:
Originally Posted by Deputypunkin View Post
Thanks for the replies. I do have a pressure regulator on that the faucet. I will try all of your suggestions...ok, my husband will!!

I'm not sure if this makes any difference but there are separate connections for city water and filling the holding tank.

Thanks again for such quick responses...really want to get this working correctly!
If you have seperate connections, then you most likely will not have a valve that directs water to plumbing or tank. Follow Flybob's procedure.
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Old 01-05-2016, 02:57 PM   #8
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Success!

Well I followed Flybob's advise to reset listed above. it's been about 5 hours and so far no water has gone into the holding tank!! Thank you so much!
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Old 01-05-2016, 02:58 PM   #9
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You could add an additional check valve just downstream from pump outlet.
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Old 01-05-2016, 04:27 PM   #10
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I had this on my last camper fortunately under warranty they replaced my water pump. It had this valve on it.
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