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Old 01-02-2020, 09:32 PM   #1
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We were forced to get our RV due to our home being damaged by hurricane Michael (Oct 2018) and it has been a life saver. Having to care for horses, dogs, cats the RV in the yard was our only option. I connected the water and electric to the house utilities but recently noticed the fresh water fill valve was leaking. I found what appears to be the solution on this forum. Thanks for helping and I hope I can repay the help.
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Old 01-02-2020, 09:44 PM   #2
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Hello & welcome to iRV2. Glad to have you.

Why don't you tell us what that solution was? It's good for members to know the outcome/fix was so, if they have the same issue, they can find your thread for the answer.

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Old 01-02-2020, 10:27 PM   #3
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Thanks for your first post. Lurking is OK, but participating is better. Please don't be a stranger. And, glad the forum was able to resolve an issue for you.
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Old 01-03-2020, 09:51 AM   #4
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Old 01-04-2020, 07:00 PM   #5
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[QUOTE=NLOVNIT;5096413]Hello & welcome to iRV2. Glad to have you.

Why don't you tell us what that solution was? It's good for members to know the outcome/fix was so, if they have the same issue, they can find your thread for the answer.


Thanks everyone, for the welcome comments. I am as new to this social media as I am to RVing. I joined at the suggestion of a friend who is a long time REer.

sorry if I confused anyone. I did not post the entire story because it was not finished. I was not sure the proposed solution was going to work for me, which it did not.
The problem is water flowing out the fresh water fill connection when connected to the city water. A comprehensive owner's manual and troubleshooting helps virtually not existent I began looking on the internet. The suggested solution said that the cause was a leaky check valve in the fresh water system and the first thing to try would be to turn off the city water and run a full tank of fresh water, thus flushing out possible debis from the system.

So, the next step is to figure out where the defective part is and replace it.
I am pretty handy so I will figure it out and I will post the results so the next person will have more information.
Stay tuned and thank you.
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Old 01-04-2020, 07:24 PM   #6
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Quote trimmed for brevity...

Originally Posted by Deweyo View Post
So, the next step is to figure out where the defective part is and replace it.
Usually the check valve is part of the water pump, or attached to it.

One possible solution..... An acquaintance was unable to access his pump until he dismantled the bed (the fresh tank was under the bed and as per Murphys law the pump and control box were inconveniently positioned). Unfortunately the RV was his bedroom until the remodeling of his house was done... So he could not access the pump for several weeks. His solution was to not use city water except to fill his fresh tank... So for a while he'd just wait until the fresh tank dropped to 1/4 then he'd fill it to 3/4...

Another idea... Back in the 1980s I saw a class A that had a 3-way valve that was plumbed in such a way that the internal plumbing was switched between the city water and the pump / check valve output...

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Old 01-04-2020, 07:35 PM   #7
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Check Valve is internal of PUMP (single diaphragm) ....debis/mineral build up eetc can cause it to NOT water backflows thru pump overfilling the fresh water tank

Using the pump will sometimes clear the chack valve
Disassembly of pump....clean check valve or replace
Install an In-Line check valve on suction line to pump

Another source can be the FILL valve leaking thru IF you have one (city water used to fill fresh water tank vs gravity port)
FILL valves seems common issue

Haven't used City Water for YEARS........always use pump
Pump provides consistant pressure/flow regardless of where we go and pump will short cycle IF we develop a leak somewhere (city water just continues to run untill RV is flooded and you have a $6000 repair costs!!!!)
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Old 01-05-2020, 09:45 AM   #8
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According to your profile you have a Heartland Mallard M25. Although your title says M25 unless you own a Mallard you would not know this. Putting this info in your signature will help others to give you specific answers since many people will not bother to hunt down the info as I did.
I am not personally familiar with how Mallards are plumbed, so you valve may be in the pump itself, a one way valve downstream from the pump or may be a switch that you turn from filling the tank to using the city water connection and sometimes that switch will also have a black tank flushing option. There are tons of different RVs and the plumbing does vary greatly. The more info you can provide on YOUR system the better the answers will be. Hope this helps you.
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Old 01-14-2020, 09:53 PM   #9
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Overflowing Fresh Water Tank

An update to say I resolved the problem of the fresh water fill port leaking.
Apparently, the problem is the check valve is leaking and the valve is in the pump. The ultimate fix is to replace the pump.
However, during the troubleshooting process, I found a shut off valve on the output side of the pump. By turning this valve off, it isolates the pump and leaky check valve from the system. Since I am always on city water (well water for me) I will make a big note to turn the valve on if I should have to resort to the fresh water tank option.
The pump is accessed by removing the furnace vent panel located in the bottom of the bathroom sink cabinet. This area is pretty cramped because you are working around the toilet. And why do they use security screws, do they really think someone is going to try to steal the pump?
Thanks to all for your help
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Old 01-14-2020, 09:54 PM   #10
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Thanks, I thought I had all that info in the profile. Will review and update.
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