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Old 10-27-2012, 12:54 PM   #1
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Losing fresh water while traveling.

Can you add a shut-off valve to the overflow, so you won't lose fresh water. I own a fifth wheel.

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Old 10-27-2012, 01:15 PM   #2
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Sure you can...........BUT if you forget to open it when filling you can break the tank if you have a pressure fill like we do!

We had that problem with our 2000 DSDP. I ended up adding some hose to the overflow and rerouting it up higher, then connecting to the existing outlet.

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Old 10-27-2012, 01:24 PM   #3
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Thank you for your reply.
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Old 10-27-2012, 04:29 PM   #4
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You also have to remember to open it when you arrive, cause air needs to get into the tank as water is pumped out. Otherwise, your pump tries to pull a vacuum and it ain't that strong!

It sounds as though your overflow hose creates a siphon when the tank is very full. Once water starts to run out, the siphon action keeps it running. You may be able to adjust or re-route the overflow hose to prevent or at least reduce that tendency. It may also help if you don't fill it quite as much, so that the siphoning doesn't start. You may actually arrive with more water if you put in a bit less.
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Old 10-27-2012, 09:38 PM   #5
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Just extend the overflow line to a higher level, maybe up around the top of the back window. I think you're getting siphoning action that drains the tank while on the road.

A shut-off is potentially risky because you might forget to open it and rupture the tank when you fill it.

The other option would be to put a solenoid valve on the overflow, connected to a sensor that figures out you're filling the tank, so that, while filling it vents appropriately, but once filled and the line disconnected, it closes the vent.

If you have pressure fill of your PW tank, rather than gravity pouring, a pressure switch on the inlet line would do the job.
Frank Damp -Anacortes, WA,(DW- Eileen)
ex-pat Brits (1968) and ex-RVers.
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