Water drained out of my tank

[taigarazz]

I have a 2014 Itasca Sunstar 30T
I dewinterized and filled my water tank a couple a weeks ago, then life got in the way and I didn't go camping.

I was driving yesterday and all the water began draining out of the tank! There are 2 drain pipes..one has a stop cock on it and is the pipe I use to drain the tank. I'm not sure what the other pipe is, perhaps overflow? I can't find it shown in my operator's manual, and it does not have a stop cock on it.

I've never had a problem with siphoning before, and am not sure why it would happen now.

Can anyone help shed some light on this, please?

Linda

[70ChevelleSS]

Our much older, 2003, Winnebago has 3 drains. The large one you can see comes right out the bottom of the fresh water tank and down thru bottom of compartment. The 2nd, smaller, comes out the top of the tank and then dumps through the bottom of the compartment, that's the overflow. The 3rd, smaller like the overflow line, is near the water pump and is the low point drain to drain the interior lines. Tank drain and low point drain both have shutoffs. You sure your low point drain was closed? Was the water pump on? If the pump is on it will empty the tank through the low point drain.

[mel s]

Originally Posted by taigarazz

I have a 2014 Itasca Sunstar 30T
I dewinterized and filled my water tank a couple a weeks ago, then life got in the way and I didn't go camping.
I was driving yesterday and all the water began draining out of the tank! There are 2 drain pipes..one has a stop cock on it and is the pipe I use to drain the tank. I'm not sure what the other pipe is, perhaps overflow? I can't find it shown in my operator's manual, and it does not have a stop cock on it.
I've never had a problem with siphoning before, and am not sure why it would happen now.
Can anyone help shed some light on this, please?
Linda

taigarazz
Was the stop cock open or closed??

[rpk]

If the tank was full and you were driving, the water probably sloshed enough to start the overflow. If I overflow my water tank when filling it will drain completely through the overflow. I could fix this if I could drill a hole high in the overflow line, but it's hard to get at and so far just a minor inconvenience.