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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > City water filling fresh tank

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augustpilot

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Posted: 02/18/18 06:41pm Link  |  Quote  |  Print  |  Notify Moderator

My trailer fresh tank fills direct on side of trailer. Tank is full. Left for week and turned city water off. Came back today and turned city water on, then while walking outside noticed water coming out the water fill overflow. Water is somehow going under pressure into fresh water tank. The water pump is new. Was working fine until turned off water pressure for week. Help please.


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ScottG

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Posted: 02/18/18 06:44pm Link  |  Quote  |  Print  |  Notify Moderator

It can only get in the tank through the pump. There is no other avenue from the city water connection to the fresh water tank.

You could:
Replace the pump
Take pump apart and rinse all parts off. This may fix it.
Install another check valve
Install a manual valve

* This post was edited 02/18/18 06:58pm by ScottG *


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Posted: 02/18/18 06:55pm Link  |  Quote  |  Print  |  Notify Moderator

Using city water only to refill the fresh water tank is the safest method.


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Posted: 02/18/18 07:08pm Link  |  Quote  |  Print  |  Notify Moderator

You may have a valve to pressure fill the tank, if so it needs to be turned off. As above, the check valve in the pump may be faulty.





D.E.Bishop

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Posted: 02/18/18 07:12pm Link  |  Quote  |  Print  |  Notify Moderator

If the water is trickling out of the overflow, I would direct my attention to the check valve in the pump head. If it is blasting out, your city water fill valve is open.


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Farmboy666

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Posted: 02/18/18 08:17pm Link  |  Quote  |  Print  |  Notify Moderator

ScottG wrote:

It can only get in the tank through the pump. There is no other avenue from the city water connection to the fresh water tank.

You could:
Replace the pump
Take pump apart and rinse all parts off. This may fix it.
Install another check valve
Install a manual valve

Not true, my tank is filled from city water connection and has nothing to do with the pump, I have to open the tank valve to fill tank or close it to use city pressure.

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Posted: 02/18/18 09:01pm Link  |  Quote  |  Print  |  Notify Moderator

Take the city water off and run the pump. If flow seems weak and pressure does not build up, you have the valve that others mention. I had one like that. It needs to be in the off position to prevent tank fill, and to allow pump pressure to build up when on pump only. If in the fill position when on pump, water just recirculates back into the tank and out the pump again.

good luck.


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77rollalong

Brighton Ontario

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Posted: 02/19/18 06:38am Link  |  Quote  |  Print  |  Notify Moderator

there should be two check valves, one on the city water between the outside water connection and the main supply lines, and another in the pump itself or between the pump and the main supply lines. sounds like the city water connection is backfeeding through the water pump due to bad check valves in it. which would also give you low pressure when running off the freshwater tank too..

beemerphile1

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Posted: 02/19/18 09:25am Link  |  Quote  |  Print  |  Notify Moderator

Farmboy666 wrote:

ScottG wrote:

It can only get in the tank through the pump. There is no other avenue from the city water connection to the fresh water tank.

You could:
Replace the pump
Take pump apart and rinse all parts off. This may fix it.
Install another check valve
Install a manual valve

Not true, my tank is filled from city water connection and has nothing to do with the pump, I have to open the tank valve to fill tank or close it to use city pressure.


Your pump has a check valve, if that check valve fails the tank can fill by flowing backwards thru the pump.


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naturist

Lynchburg, VA

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Posted: 02/19/18 10:06am Link  |  Quote  |  Print  |  Notify Moderator

It is also possible that a little bit of rubbish has gotten caught in the check valve on the pump. Since it is a new pump, this is more likely than that the valve is faulty. Try shutting off the city water, turning on the pump, and running a little water out of one of the spigots. A bit o' crud might vacate that check valve and restore normal operation.





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