Fresh water Tank issue

[B&B]

Getting ready for a dry camping trip soon and having an issue while sanitizing the fresh water tank. Has anyone had a problem with water flowing out of the blue hose about 2 feet behind the the fresh water drain? Looking at the tank there is a white overflow hose attached to the top so not sure what this second blue hose is for or how to stop it??

[atom ant]

It's a siphoning issue. For a short fix you can valve it off.

[NW Snowbirds]

Go to the Redwood RV Products section of this forum and open the topic"Too Many Drains" for a full discussion.

[B&B]

Thanks for the information, no time to get back to dealer before this trip. Will have them fix it when it goes in for the annual inspection.

[atom ant]

Which brings up a point - I need to fill our tank for use next week. I the valve that can be put on there just the same as any pex valve at Home Depot?

[5th_Time]

The PEX valve is cheap. It's the PEX installation tool that's a killer!

If you're feeling adventurous, take down the bellypan on that side. Follow that blue PEX line back to the fresh water tank's vent outlet. Splice in a loop of flex hose from the tank, back up through the floor and then back down again. That breaks the siphon and then you can fill the tank up all the way.

That's all that Redwood did when I had it back to the Service Center for this problem.

[atom ant]

I assume you the mean the crimpers that are expensive? Ya I see that. $50 to crimp a $3 valve. Is it all 1/2" pex? I wonder if I could just use a screw clamp for a temp fix. I have a feeling I may need to pull the belly later because my tank drain is terrible slow and is probably kinked up there anyway.