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Old 04-10-2015, 10:23 PM   #1
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Water going into fresh water tank

Has anyone had a problem with water going into fresh water tank when the filler valve in closed? I am hocked up to outside water and it seems to be leaking into my fresh water tank, had a repair man out here today to replace the filler valve and it's still filling up my tank. Please help
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Old 04-10-2015, 10:46 PM   #2
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Quote:
Originally Posted by spank View Post
Has anyone had a problem with water going into fresh water tank when the filler valve in closed? I am hocked up to outside water and it seems to be leaking into my fresh water tank, had a repair man out here today to replace the filler valve and it's still filling up my tank. Please help
I'm having an intermittent fresh water valve leak that can fill my tank up. I will need to replace my valve in the near future. I would have thought a replacement valve would solve your problem unless it was faulty. I would think the repairman's work is warranted so I would go back to them to figure it out.
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Old 04-11-2015, 03:57 AM   #3
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Backflow through the pump?
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Old 04-11-2015, 06:14 AM   #4
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My City water hook-up was filling my fresh tank. I"m not sure why, I don't see anything in the water bay that I can shut that off with. I do need to figure it out this spring
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Old 04-11-2015, 06:59 AM   #5
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The check valve in the water pump is failing. On mine I put a separate check valve in the line from the pump.
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Old 04-11-2015, 07:00 AM   #6
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All of the RV's I have experience with seems to use this basic water layout. The one shown below is one I drew for a 97 Fleetwood Discovery. As you can see, there are two ways water can enter the water tank. One is through the city/tank fill valve and the other way is through the water pump if the one way valve becomes defective.

So if you have changed the city/tank valve I would look to the water pump one way valve. Could be a small speck of dirt keeping the valve from working properly.
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Old 04-11-2015, 08:31 AM   #7
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There are three ways to fix this: 1) rebuild the pump; 2) replace the pump; or 3) add a check valve or shut off valve between the pump and the water tank.

You can also help prevent this by never turning on the water pump when connected to city water. If you find this happening while on a trip, you can sometimes fix the problem by turn off the city water and pump and opening a faucet to depressurize the system. Making sure the pump is still off, slowly open the city water valve and repressurize.
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Old 04-12-2015, 09:04 PM   #8
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Has anyone had a problem with water going into fresh water tank when the filler valve in closed? I am hocked up to outside water and it seems to be leaking into my fresh water tank, had a repair man out here today to replace the filler valve and it's still filling up my tank. Please help
I had the same issue. In my case it was the city water/tank fill valve. It was not closing completely and this was causing water to seep into the onboard fresh water tank when I was hooked up to city water.

Good luck!
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Old 04-13-2015, 04:07 AM   #9
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Normally, you can usually check if it is the pump allowing back feeding.

Turn off city water, turn on pump (with water in the tank of course) and make sure pump is supplying water to the MH by turning on hot and cold faucets.
Turn off faucets. Pump should stop within a few seconds.

Pump should remain off.

If pump is cycling on for a second or so and then off for a lot longer, then it is possible there is back flow back through the pump.

Trouble is, if the tank fill valve is leaking (despite being a new one), this will give exactly the same symptoms, but if you are certain the new fill valve is good, then this test should confirm the condition of the pump.

If the pump problem is due to debris caught under a valve seat, then running the pump with town water disconnected and cycling the pump using the faucets turned on and off rapidly and fully, may flush the debris out

To check the pump fully is still fairly simple. With pump off and town water connected, disconnect the hose on the suction side of the pump and see if water continues to flow back out of the pump inlet port. If it does, then the pump is the problem
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Old 04-13-2015, 11:38 AM   #10
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To check the pump fully is still fairly simple. With pump off and town water connected, disconnect the hose on the suction side of the pump and see if water continues to flow back out of the pump inlet port. If it does, then the pump is the problem
Before doing this, make sure to close the valve from the fresh water tank that supplies the pump. And instead of removing the suction side hose, many pumps have a strainer screen with a clear cap -- removing this will accomplish the same thing.
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Old 04-13-2015, 11:47 AM   #11
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Make sure the fill selector valve is ALL THE WAY to its stop, don't just use the decal stop position line...go past it till you feel it stopped.
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Old 04-13-2015, 01:58 PM   #12
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Originally Posted by Rossi6998 View Post
I had the same issue. In my case it was the city water/tank fill valve. It was not closing completely and this was causing water to seep into the onboard fresh water tank when I was hooked up to city water.

Good luck!
Same hear. Actually had two defective by pass valves. The tiniest leak will bleed into your FWT.
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Old 04-15-2015, 11:01 PM   #13
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Originally Posted by Rossi6998 View Post
I had the same issue. In my case it was the city water/tank fill valve. It was not closing completely and this was causing water to seep into the onboard fresh water tank when I was hooked up to city water.

Good luck!
That was my problem, too. The selector valve apparently picked up a little piece of grit that prevented it from closing completely. I worked the valve full cycle 15-20 times and that seems to have cleared the obstruction, because the problem has not reoccurred in several months.

Cheers,
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