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Old 05-18-2018, 05:11 PM   #1
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Water tank leak

New owner of a 35SS cruiser and first outing after filling water tank, have a dripping leak at the valve. It is not the valve itself, is above it. Has anyone had the coroplast down and can tell me if the hose that has the drain has a crimp fitting at the top? The tank only leaked until it was at 1/3 level then stopped. Thinking maybe a leak at the upper connection is the cause. Thanks for any help offered.
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Old 05-18-2018, 05:45 PM   #2
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I have a 2017 Sunset Trail that has had two leaks. First leak was from the tank. The factory had put a screw into the tank. Dripped from the underbelly until about 2/3's full.

Second leak was a hose connection into the tank.
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Old 06-03-2018, 08:13 PM   #3
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If you’re talking about some leakage at the pressure relief valve, that’s normal. The temps of these water heaters are high enough that the tank will bleed off a little water until the pressure is reduced. My source for this is Trailer Life magazine and the Suburban Water Heater manual.
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Old 06-03-2018, 10:03 PM   #4
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If you’re talking about some leakage at the pressure relief valve, that’s normal. The temps of these water heaters are high enough that the tank will bleed off a little water until the pressure is reduced. My source for this is Trailer Life magazine and the Suburban Water Heater manual.
Fresh water tank, NOT the water heater...
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Old 06-03-2018, 11:07 PM   #5
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Ah, a horse of a different color. I’ve got nothing on that.
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Old 06-04-2018, 04:09 PM   #6
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So, you reckon he found the leak???????? We’ll never know probably.
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Old 06-10-2018, 11:21 AM   #7
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Have not taken the coroplast down yet to search for source of leak, will post when I find it. Was hoping for some info on how it is connected to the tank.
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Old 06-10-2018, 12:41 PM   #8
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Yea let us know.
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Old 06-10-2018, 01:55 PM   #9
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Have not taken the coroplast down yet to search for source of leak, will post when I find it.


Was hoping for some info on how it is connected to the tank.

Mine has a nipple/elbow (which screws into the tank) on the openings. Then it's usually a good old hose clamp holding the hose onto it.
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Old 06-10-2018, 02:27 PM   #10
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Well I got time to look at mine and it has pex pipe onto a 90 elbow, and it’s the bung in the tank that’s leaking. I assume these are glued or plastic welded in place, so maybe some good old silicone around it will cure the leak. Does anyone have a better idea for sealing it up? Thanks
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Old 06-10-2018, 06:51 PM   #11
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Neil, you are correct, it's pex pipe that comes off the fittings. I wasn't remembering it correctly. The filler pipe is what has the hose with the hose clamp on it. That was what was leaking on mine, and it took a couple trys to get it sealed.


Story was, those big fittings are spun into the tank when they're made, and that seals them. You might do some goggle searching for tank suppliers or manufactures and give them a call to see if its possible to seal it now.
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Old 06-10-2018, 07:14 PM   #12
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I found this link. I don't know if it will fit your situation or not if it's the bung leaking and not a fitting.
How To Fix A Cracked Leaking Water Tank Outlet With Thread & Silicone
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Old 06-10-2018, 08:08 PM   #13
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This is what the fitting on the tank looks like with a kinked hose that I found on mine the first day I had it . sorry for the dark pics
Attached Images
File Type: jpg kinked black tank flush .BEFORE ..001.jpg (104.2 KB, 6 views)
File Type: jpg kinked black tank flush .AFTER 004.jpg (63.1 KB, 5 views)
File Type: jpg kinked black tank flush. AFTER 002.jpg (116.0 KB, 8 views)
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Old 06-16-2018, 04:01 PM   #14
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Tank fitting leaking

Cannot remember the product name, but West Marine sells epoxy for rotomolded plastic tanks. It works for fittings and if reinforced it will seal cracks. Have heard Gorilla makes one too. Good luck and happy trails.
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Old 06-16-2018, 08:04 PM   #15
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Made to fix leaks in tank. Plasti-Mend Black
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Old 06-17-2018, 06:19 AM   #16
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Plasti-Mend will not work on Polyethylene plastic. This is usually the opaque milky-white plastic used for water tanks or the milky-grey plastic used for some holding tanks.



I take it that the above statement means it won't work on rv water tanks. Unless I'm reading their add wrong.
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Old 06-17-2018, 10:48 AM   #17
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You're correct Lloyd. But the tank in the picture is black, which usually indicates it's an ABS tank. Valterra brand tanks are ABS.
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Old 06-17-2018, 08:04 PM   #18
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Quote:
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Have not taken the coroplast down yet to search for source of leak, will post when I find it. Was hoping for some info on how it is connected to the tank.
It's under warranty. Let them know and take it in after you done with it for the season or if you have time between trips do it then.
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