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Old 10-20-2017, 07:15 AM   #1
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Fresh Water Overflow

Where on my 28.5 RSTS is the fresh water overflow?
Going on a boon docking trip soon and will be completely filling fresh water tank for the first time.
Thanks,
Lafitte
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Old 10-20-2017, 08:16 AM   #2
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It may very well be different on your rsts but on our 27.5 rlts it is on the curbside a few feet in from the rear of the trailer just inside of the frame rail. More or less in line with the low point drain by the rear bumper.

Do be aware that once full and it starts flowing it may very well create a siphon and continue to drain the tank. That happened to us quite a few times where I would fill it then get to the campsite only to find I have a 1/3 of a tank of water left. Many have put a valve on the end of that hose. Just make sure that it is open during filling.

I complained about it to our dealer when it was in for warranty work I was told it is normal just fill up when you get there. I responded with that is fine as long as there is water where you are going but I wouldn't need to fill the tank before I left if there was water where I was going. When I picked it up they said they fixed it by rerouting the line higher up somewhere. I still have to pinch the hose when it is filled to stop it but once stopped it doesn't seem to start the siphoning anymore while underway
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Old 10-20-2017, 08:36 AM   #3
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H2o

Thanks barryg.
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Old 10-20-2017, 09:22 AM   #4
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Quote:
Originally Posted by barryg View Post
It may very well be different on your rsts but on our 27.5 rlts it is on the curbside a few feet in from the rear of the trailer just inside of the frame rail. More or less in line with the low point drain by the rear bumper.
^^^ This (I have a 28.5).

It is a large-ish diameter, corrugated tube.
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Old 10-22-2017, 07:27 AM   #5
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It is a large-ish diameter, corrugated tube.
I mis-remembered, it is a flattened, "sleeve"-like flexible tube, not corrugated.

I winterized yesterday so I was under there for the low-point drain.
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Old 10-25-2017, 04:09 PM   #6
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Back right corner.
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Old 10-25-2017, 05:43 PM   #7
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When boon docking in the summer every drop of water counts. I will fill the tank until it overflows and then stick a cork in the overflow tube. When I get to the campsite I always take the cork out so the pump doesn't create any vacuum issues. If I don't use the cork sometimes I lose over 1/3 of the tank on the way there.
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Old 10-26-2017, 07:20 AM   #8
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Originally Posted by EV4D View Post
When boon docking in the summer every drop of water counts. I will fill the tank until it overflows and then stick a cork in the overflow tube. When I get to the campsite I always take the cork out so the pump doesn't create any vacuum issues. If I don't use the cork sometimes I lose over 1/3 of the tank on the way there.
Good idea. I usually fill mine until it overflows then wait for it to stop and then fill again until I just see the water start coming out. Not sure how full a tank I have this way as the OE tank gauges are pretty much useless.
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Old 11-24-2017, 01:23 PM   #9
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Thanks PlayersZ28,

My 27.5 RLTS does the same when filling my water tank. I mostly boondock and the last couple of times I showed up with a 1/3 or so of a tank left. I was really mad, but thank you for the info on getting it to stop. I will try that this next season.
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Old 12-18-2017, 04:49 PM   #10
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H2O tank

Filled my tank prior to a recent trip. Plugged overflow tube with cork as recommended.
However , person who was following me said water was sloshing out back of unit whenever I stopped and restarted .
Water in rig lasted almost a week , (no showers , 3 men on hunting trip).Showers at CG.
?
I never trust gauges in an RV, so can't comment on them.
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