2013 Itasca suncruiser fresh water tank.

[Kenneth 1965]

I try to fill my fresh water tank either from the side fill or from the wet bay fill. The water will not go into my fresh water tank. A few minutes later it comes out of a tube located near the gas tank fill tubes underneath the motorhome. What could be the problem? I have filled it several times before without issue!

 

[Morich]

Tell us which Suncruiser you have and we can then look at how the lines are run for what might be a problem.

But it might be a first thought that the water running out underneath is overflow! Seems a weird thing but are you sure it is not just full and you are getting bad info from a monitor/level system not working?
What happens if you drain the tank and then try to fill?

More info, please?

 

[Kenneth 1965]

Model

Itasca Suncruiser 35p

Picture shows where it drains from. Drivers side by gasoline fill tubes.

 

[Morich]

Let me check what you mean?
The water won't go in the tube at either point?
Or it goes in but doesn't get to the tank?
Not clear in the picture if the water is coming out of the end of a clear tube or is it coming out near a tube. Not sure what I'm seeing!
Click this snip of what the drawings show at this spot near the two fresh tanks.

If the tanks are full, any added water may be coming out of the end of the overflow when you put water in gravity or pressure!

If the tube that goes to the pump is pulled loose water would run out the fitting that is left on the tank.
Any chance of freeze damage breaking one of the elbows where water would pour out?

A different thought might be to check the tank drain on the other end is closed! No chance it is open and water it running across insulation to come out and confuse us where it comes from exactly?


I'm always hoping I missed something like that if it keeps me from having to fix something bigger!

Good luck with the chase and let us know how it goes?

 

[Kenneth 1965]

Tube

The tube you see is about 4” long and just goes up into the underneath of the motorhome. It’s just near the gas tank fill tubes. Those are the tubes you see in the photo. I will crawl under and get you a better picture tomorrow. No it hasn’t frozen here yet. So I am wondering if part of the pump has a back flow or something that stuck open allowing a direct connection to the drain. The regular drain is closed. That ones easy to see. Maybe I will drain the whole tank and try again. I can see the tanks water line is 1/3 full and the monitor inside says the same thing. No matter where I try to fill it no water is disturbed in the tank. Thank you so much for the pictures and input!

 

[Morich]

Well, that does sound like a mystery!
A clear tube that is sticking fully 3-4 inch through the bottom cover really sounds like the only thing it could be is the overflow!
Any broken or cut off tube would not be expected to come that far out underneath but drop and lay on it.

But that doesn't seem to fit as the overflow should not get water in it until at least one of the tanks was full. Both the gravity fill and the pressure water go into the top of the different tanks at different locations.
To get water to go up and out of the tank into the overflow seems it would have to be passing full tanks to get there! Really hard to get water to go up if it has a chance to go down and spread out in the tank!

I don't think of the water pump check valve as a sticking point as it has a funny rubber diaphagm to pass through to get from the tank and that is hard to see passing much water if the pump isn't running.

Weird but an idea to look at? Desperate for explanation!
Is there a small hole next to the gravity fill port? That is where we often see a vent for the tank to let air go out as we put water in!
If that tube is there on your system, is it open to let air out?
If the vent is stopped up, say a mud dauber built a nest there? Would that make water come out the over flow if the over flow tube was sticking way down too far in the tank?

Hard to believe but maybe try to rig some way to run water in that tube (if it is there!) to verify it is open?
Any way to see how to cap or close the spot that leaks and see where the water goes then? Do both tanks then fill correctly passed where it leaks now?
If you cap the tube that I think must be the overflow and you fill way beyond full the next place to come out would seem to be the gravity fill.

Sorry! Really stretching for how it is doing this!

 

[Kenneth 1965]

New drain pic

. I still haven’t figured it out but will test again this weekend.

 

[Morich]

Yes, that is certainly not a broken item that got down where it shows. That very much says it is the overflow!
Still a mystery!
Just to get a different view, we also have plumbing drawings here:
https://www.winnebago.com/Files/Files/Winnebago/Resources/Diagram/Plumbing.htm
I had been using an interactive parts catalog here:
https://catalog.winnebagoind.com/menu/Parts.htm

But this is a different way of showing the same but gives parts number, etc. I thought to spot anything left off the parts drawings but see none! they both show near the same but in different ways.

Gravity feed water should come in to left tank and run to right at connection near bottom and water has no reason to go high until near full!

Water pump draws water from near bottom and feeds it to pump up an dover left tan, so I would not expect it involved at all!

If the hose water (green) comes in at top of right tank, how it gets into either of the connections on the overflow is not clear!!

Forget my idea of a vent line as the overflow should easily serve to vent air out as we put water in! Thinking of different setups on different RV.

No ideas or signs anybody has had the tanks out or done any mods?
Something STRANGE that I'm missing! How does water get from green line into red overflow tube???