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10-20-2014, 04:27 AM
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#1
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Montana Master
Join Date: Nov 2013
Location: Willow Spring, NC
Posts: 989
M.O.C. #13909
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Fresh Water tank cap leaks
I have a steady 1 drop per 3 seconds leak coming from my Fresh water tank via the cap. First I just tried hand tightening it, but it kept spinning. So I check to see if the clap holding the cap male and female fitting was loose and it was. Once tight, I could hand tighten the cap, but still the same leak.
Is this a common problem? Do I need a new cap? Do I need to use Teflon tap?
The fresh water tank drank is just a potable water hose with the cap assembly clamped on. Is there a superior solution made of brass that someone has tried??
__________________
Jim & Martha Abernathy
2014 Montana 3402RL Level UP, Sailun S637's, TST 507, 500W solar
2014 Ram 3500 Laramie® 4x2 diesel dually crew-cab 3.73 axle, Reese R20
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10-20-2014, 05:13 AM
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#2
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Montana Master
Join Date: Sep 2014
Location: Full Timer In Naples, Florida
Posts: 1,049
M.O.C. #15731
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I have the same problem. so I am going to remove the crimp style and add a stainless band clamp and see if that stops the leak. I am hooked up to city water right now so I haven't fixed it yet.
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2017, 3500 Ram Big Horn, 4x4, Crew Cab, DRW, Aisin Transmission, 4:10. Curt Q20, 2014 Mountaineer 331 RLT, Sailun's on the rv and truck.
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10-20-2014, 05:15 AM
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#3
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Montana Master
Join Date: Feb 2008
Location: Hillsboro
Posts: 593
M.O.C. #8238
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You should not have any leak at all. You should also not have to use Teflon tape. Depending on which model trailer you have, the cap should have a tapered fit inside, for a tight seal. It's possible someone put the wrong cap on. Also, if it was loose, it may be damaged now, and it might be simpler to replace it with a new one. Also, consider the possibility that it might not be the cap itself, but it might be running down that hose from up above somewhere, and dripping off the cap.
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Terry and Patsy
Vietnam Veteran, US Navy
2017 3810
2015 GMC Sierra 4X4 3500 SRW
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10-20-2014, 05:24 AM
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#4
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Montana Master
Join Date: Feb 2005
Location: Haysville
Posts: 4,261
M.O.C. #3085
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Like said ... teflon tape will be a waste of time as the fitting seals off a taper not by the threads. There may be a cut or gouge in the taper either on the cap or base fitting. A new one's cost is minimal and easy to replace. Some have bought a ball valve and installed in place of the screw on cap/ftg. The valve and a pipe nipple to make it work on the end of the plastic hose can be had at any hardware store.
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10-20-2014, 05:53 AM
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#5
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Montana Master
Join Date: Nov 2005
Location: Paola
Posts: 5,739
M.O.C. #4961
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I removed mine and added a ball valve like Dieselguy stated.
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Dennis & Linda Ward
Paola, Kansas
Montana 3735MK Legacy Edition
1200 watts of Solar
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10-20-2014, 07:02 AM
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#6
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Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,198
M.O.C. #13740
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If the fresh water fill you are talking about is the gravity fill cap, then the tank is overfilled or the 12v water pump is allowing city supply water to creep past its check valve into the tank. Neither situation is what you want. John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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10-20-2014, 07:15 AM
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#7
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Mine came from the factory with a ball valve.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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10-20-2014, 08:49 AM
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#8
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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If it's the drain valve on the bottom then the solution is a ball valve which is what we did. If the water is coming from the fill area then it's the overflow tube located right next to the fill cap with a screen on the end. As John stated, if that's the problem you have water seeping into your fresh water tank, besides John's suggestion it could also be that your fill valve in the convenience center isn't closing totally.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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10-20-2014, 09:29 AM
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#9
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Montana Master
Join Date: Nov 2013
Location: Willow Spring, NC
Posts: 989
M.O.C. #13909
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Problem solved, except my clothes are soaked. The cap that leaked was on the bottom of the RV at the rear to drain the fresh water tank. I just cut off the existing cap assembly and put in a 1/2" barbed-to-threaded brass connector and then attached a brass ball valve to that. Nothing like 85 gallons of cold water squirting down on you to make you work faster.
__________________
Jim & Martha Abernathy
2014 Montana 3402RL Level UP, Sailun S637's, TST 507, 500W solar
2014 Ram 3500 Laramie® 4x2 diesel dually crew-cab 3.73 axle, Reese R20
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