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Old 05-02-2019, 10:55 AM   #1
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Filling the fresh water tank

For some reason our 2018 Wildwood will not take water into the fresh water tank.
When we took delivery in January the tank was 1/2 full, so I drained it to reduce the road weight. I closed the drain value thats located, on the frame just under the kitchen window.

I 1/4 filled the tank to add bleach to clean the tank, all was good. I again drained the tank.

Now I'm going on an extended trip into the Everglades, and need to refill the fresh water tank, BUT when I place the hose from the fresh water supply into the tanks entry, all the water comes flooding back out, and I noticed a bit of water inside the trailer on the floor near the kitchen sink.

The only difference between the 1st 2 fills is I placed pots & pans in the cabinet below the sink and near the fresh water inlet pipe.

Question is there a directional valve in the fresh water tank inlet, that could be malfunctioning, one that preserves pressure or something.

Thanks on advance
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Old 05-02-2019, 11:06 AM   #2
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Originally Posted by Florida.Traveler View Post
For some reason our 2018 Wildwood will not take water into the fresh water tank.
When we took delivery in January the tank was 1/2 full, so I drained it to reduce the road weight. I closed the drain value thats located, on the frame just under the kitchen window.

I 1/4 filled the tank to add bleach to clean the tank, all was good. I again drained the tank.

Now I'm going on an extended trip into the Everglades, and need to refill the fresh water tank, BUT when I place the hose from the fresh water supply into the tanks entry, all the water comes flooding back out, and I noticed a bit of water inside the trailer on the floor near the kitchen sink.

The only difference between the 1st 2 fills is I placed pots & pans in the cabinet below the sink and near the fresh water inlet pipe.

Question is there a directional valve in the fresh water tank inlet, that could be malfunctioning, one that preserves pressure or something.

Thanks on advance
not 100% sure but my FR Vibe fresh water inlet I stick a hose in it and fill and there are no threads, if your inlet has threads then it is a pressure fill not gravity, water leak inside your unit I don't know, there are plenty of threads on this, search in plumbing section, hope this helps
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Old 05-02-2019, 11:07 AM   #3
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There's no check valve in the fill line. You probably have a kink in the fill line since you sounded like no water will go into the tank at all now.

Can you see the hose inside the RV between the tank and the fill fitting?
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Old 05-02-2019, 11:08 AM   #4
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Sounds like your inner house may have pinched itself off. Follow the inlet line where you can and look for a kink or cut in the line.
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Old 05-02-2019, 11:11 AM   #5
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You say you 1/4 filled the tank before this problem............did that go ok?


Possibly you just need to lower the pressure going in, and wait longer. That'd be the easiest fix, if true. Kinks don't sound like the issue, or the kink would have shown up when you 1/4 filled it.


Something changed. If only the amount of water/sec you're trying to put in now, then just slow down.


If something else, then a closer inspection is needed to see if something is obstructing.


And FWIW, my fresh water tank fills with just changing a valve on the same incoming hose. So it's threaded of course. But it doesn't say "Fresh Water", it says "Gravity Fill". So threaded and Gravity Fill CAN go together on some trailers. Fresh Water tank filling method seems to vary greatly.
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Old 05-02-2019, 11:24 AM   #6
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First thought: if you insert the hose too far into the fill tube it can block the vent tube. This effectively seals the fresh water tank, creating a pressurized tank as you try to force water into it.
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Old 05-02-2019, 11:27 AM   #7
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First thought: if you insert the hose too far into the fill tube it can block the vent tube. This effectively seals the fresh water tank, creating a pressurized tank as you try to force water into it.

Shouldn't. The vent line should be an independent pipe from the external vent to the tank.
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Old 05-02-2019, 11:30 AM   #8
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Shouldn't. The vent line should be an independent pipe from the external vent to the tank.
Must depend on the manufacturer/trailer. Speaking from experience with a previous trailer.
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Old 05-02-2019, 12:04 PM   #9
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My TT vent tube comes to the top of the fill tube and has a small screen on top.
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Old 05-02-2019, 12:14 PM   #10
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My vent is a piece of screen with nothing attached to it. The air vents from the overflow fitting on the tank.
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Old 05-02-2019, 12:19 PM   #11
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Makes no sense to me. Every one I have ever dealt with waas simply a hose from inlet to tank and a simple gravity flow. I would say you must have a kink in hose unles there is some obstruction in the line.

3 I have delt with the inlet is located right above the fresh water holding tank so it is a vary short run of hose to the tank.

I have done some crazy things (ie hooked my city water by mistake to black tank flush) So I ask, .... are you sure your water tank is not full?

I cant imagine there being any type of valve between inlet and tank.
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Old 05-02-2019, 12:33 PM   #12
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Shouldn't. The vent line should be an independent pipe from the external vent to the tank.
Like he said.

I would check the hose for the vent. Sometimes it is a loop of hose hooked to nothing. Water sits in the low part of the hose and does not allow venting.
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Old 05-02-2019, 12:39 PM   #13
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My TT vent tube comes to the top of the fill tube and has a small screen on top.
Mine too.

When the tank fills, water comes out that overflow tube with the screen as is intended. Curiously though, the next time I fill the tank, unless I blow out that screened vent the tank will only fill about 2/3 before the water shoots out the fill tube. There is a low spot in the vent tube that holds a slight amount of water and blocks the vent. I use a hose from the shower hand piece, that fits that vent screen holder perfectly and allows me to blow through it to clear the vent passage... And you can tell immediately when that occurs. Then the tank fills normally
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Old 05-02-2019, 01:27 PM   #14
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Mine too.

When the tank fills, water comes out that overflow tube with the screen as is intended. Curiously though, the next time I fill the tank, unless I blow out that screened vent the tank will only fill about 2/3 before the water shoots out the fill tube. There is a low spot in the vent tube that holds a slight amount of water and blocks the vent. I use a hose from the shower hand piece, that fits that vent screen holder perfectly and allows me to blow through it to clear the vent passage... And you can tell immediately when that occurs. Then the tank fills normally
X2, just happened to me last week. I had to find a piece of tubing to cover the screen and blow out the vent line back into the fresh water tank.
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Old 05-02-2019, 01:34 PM   #15
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First things first... to the OP... do you have a fresh fill that is gravity, meaning does the fill hose simply insert/stick into the fill port as the water goes in?
Or... do you have a specific valve you turn while hooked to city water or port with a threaded fitting for the garden hose and it fills via pressure?

Once we know this we can better answer assumptions about vent lines and where the water is backsplashing out of.
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Old 05-02-2019, 01:37 PM   #16
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Pics could possibly help.
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Old 05-02-2019, 02:02 PM   #17
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Another thing to try is to drive the fill side tires up on blocks/boards and make it higher. Worked on my Rockwood. Stopped the blow back.
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Old 05-02-2019, 02:14 PM   #18
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Originally Posted by TheWolfPaq82 View Post
My vent is a piece of screen with nothing attached to it. The air vents from the overflow fitting on the tank.
The overflow would function as a vent IF the overflow hose is connected to the top of the tank or at least the top of the tank sidewall.
I had a problem because they connected the overflow hose to the tank at the same level that the inlet hose (bottom of the sidewall) so it can function as a overflow but it can not function as a vent for as soon as the water level inside the tank reaches the overflow connection, it stops working as a vent and pressure starts to build up inside the tank...
I have a 43 gal tank but could only put 10 until I added a proper vent to the tank, one that connects to the tank at the top of the sidewall... Now I can put 37 gal in the tank.
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Old 05-02-2019, 02:24 PM   #19
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You mentioned that you opened the low point drain on the frame just under the kitchen sink. Now go under the RV and find the actual white plastic fresh water tank and you'll find a petcock drain on the very bottom of it. Your tank may actually be full.

Refill at slow flow
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Old 05-02-2019, 02:46 PM   #20
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Try moving the pots and pans you put under sink since last fill.
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