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Open Roads Forum  >  Fifth-Wheels

 > Fresh water tank

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M.R.E.

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Posted: 09/27/21 12:20pm Link  |  Quote  |  Print  |  Notify Moderator

I have a '15 Columbus which the fresh water tank was never used. When I winterize with air and drain , I always have a little bit of water come out of fresh water drain. I was going to sanitize my tank, but first flush it out. When I added some water nothing came out of the drain. I took an air hose and blew up the drain to possibly remove any blockage. Still no water coming out. I don't want to fill it and get stuck with a full tank. HELP


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Posted: 09/27/21 12:34pm Link  |  Quote  |  Print  |  Notify Moderator

You say "fresh water tank never used", but yet a little water comes out when winterizing??

Sounds silly, but are you sure you are opening the fresh water tank drain, or maybe the low point drain?

Jerry





M.R.E.

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Posted: 09/27/21 12:48pm Link  |  Quote  |  Print  |  Notify Moderator

I only have gray and black water drains. Other low point drains are for hot and cold water drains.

valhalla360

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Posted: 09/27/21 01:28pm Link  |  Quote  |  Print  |  Notify Moderator

There should be a drain for the fresh water tank also...otherwise, you have to dilute with large amounts of antifreeze to protect the tank.

Blowing air up the low point drains shouldn't have any impact on the fresh water tank as there should be a one way check valve at the pump that would stop any flow back into the tank.

So it's not clear what issue you actually have.


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Cummins12V98

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Posted: 09/27/21 01:40pm Link  |  Quote  |  Print  |  Notify Moderator

MFL wrote:

You say "fresh water tank never used", but yet a little water comes out when winterizing??

Sounds silly, but are you sure you are opening the fresh water tank drain, or maybe the low point drain?

Jerry


Could be an internally leaking water pump.


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MFL

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Posted: 09/27/21 02:25pm Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:



Could be an internally leaking water pump.


Yup, that happens, can put water in tank, but OP states that he added water to tank, but nothing comes out drain?

Something is amiss, curious to hear outcome!

Jerry

Cummins12V98

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Posted: 09/27/21 08:38pm Link  |  Quote  |  Print  |  Notify Moderator

MFL wrote:

Cummins12V98 wrote:



Could be an internally leaking water pump.


Yup, that happens, can put water in tank, but OP states that he added water to tank, but nothing comes out drain?

Something is amiss, curious to hear outcome!

Jerry


Oops, reading and comprehension is fundamental.

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Posted: 09/28/21 06:36am Link  |  Quote  |  Print  |  Notify Moderator

Breaking this down for my own understanding and clarification:

I have a '15 Columbus which the fresh water tank was never used.
So you have never used your FW tank?

When I winterize with air and drain , I always have a little bit of water come out of fresh water drain.
Where are you draining from? FW tank drain, low point drain? Could it be you simply just have a little water in the lines even if you never use your tank and always use City water? How much PSI are you using to blow the lines out? Have you switched the winterization valves?

I was going to sanitize my tank, but first flush it out. When I added some water nothing came out of the drain.
How much water did you add and where did you add it? FW tank fill, does yours have a valve to switch from City water to FW tank?

If I were to try and summarize; you have never used your FW tank - odd but ok. Is this 6 year old RV new to you and if so have the previous owners used the tank? When you drain, you have some water coming out. I am not sure how you know this is coming from your FW tank - could very easily just be water in the system. Have you ever used your water pump if you've never used your tank? Now you are concerned that if you do eventually use your FW tank it won't drain - despite claiming it's draining something despite not being used?


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way2roll

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Posted: 09/28/21 06:43am Link  |  Quote  |  Print  |  Notify Moderator

M.R.E. wrote:

I only have gray and black water drains. Other low point drains are for hot and cold water drains.


I am not sure this is entirely accurate. You should have a fresh water tank drain as well as a low point drain. The FW tank drain does just that, drains the FW tank. The low point drain allows all the water to be drained from the system from all the lines. Your grey and black tank drains are waste drains and separate from your water system. Sounds like you need to find your FW tank drain.

M.R.E.

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Posted: 09/28/21 07:42am Link  |  Quote  |  Print  |  Notify Moderator

I wasn't blowing air up the low point drains for hot and cold water. It was the fresh water drain which also looks like a low point drain but is the fresh water drain. I pushed up the drain a coat hanger wire and felt a blockage and after going up and down for awhile it went up and drained the tank. I filled it and drained it and everything is fine. There must be some debris that blocked it.

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