Community Forums

ChiefDodd · 10-05-2018, 12:03 PM

As a Rookie Class A Owner, I accidentally left the valve on Fill Tank Position instead of moving it to City Water. It overfilled the tank and opened the Overflow Drain under the RV. This drained every drop of water from the tank, but now it IS STILL OPEN. I can't figure out how to close the overflow valve.

When I try to fill the tank it starts pouring out immediately!

Can anyone help me figure this out?
My only solution would be to plug the drain.

Email address: chiefdodd1950@gmail.com

**Lt Dan** · 10-05-2018, 12:49 PM

Please post the make and model of your motor home. Every coach builder has different methods of plumbing the overflow.

scott 61 · 10-05-2018, 02:35 PM

It sounds like you have the valve open to empty the tank
It would not come out of the Overflow until the tank was full

MSHappyCampers · 10-05-2018, 02:48 PM

Hi !

Welcome to IRV2! We're sure glad you joined the gang!

On most rigs the freshwater tank overflow does not have a shut-off valve! Have fun and keep her between the ditches!

Good luck, happy trails, and God bless!

RKins · 10-05-2018, 03:22 PM

I've read on here that on some coaches when the fresh tank over fills and starts draining on the ground it creates a vacuum that keeps the water draining until it is empty. Seems to be pretty common.

Here is a search result that may help you with this.
https://www.google.com/search?q=fres...earch=irv2.com

Outbound · 10-05-2018, 03:23 PM

Ditto on open drain valve.

winniman · 10-05-2018, 03:56 PM

The overflow drain doesnt have a valve, it is actually the vent for the tank. It is on or near the top, and if you overfill the tank, it will start flowing out the vent. If the tank is overfilled, it will continue to run out the vent until the water drops below the vent. I have found in the past, if the water is running out the vent tube, open a couple taps in the rv to create a suction into the tank in the vent pipe. This should stop the water coming out. If your water tank didnt have a vent, when you use the water at the tap, it would collapse the tank. Some people just fill up the tank until the water starts pouring out. If your tank is like mine, and likes to siphon part of it back out, I just watch the water guage in the rv, and stop when it reads full. x2 on you having the drain valve open. The vent can only drain it when it is full. Hope this helps.

ChiefDodd · 10-06-2018, 04:56 AM

Since my tank continues to drain every time I try to fill it I am going to try the solutions all of you have suggested.

I’ll keep you posted on my results.

Chief Dodd