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09-28-2020, 07:59 AM
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#1
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Montana Fan
Join Date: Nov 2017
Location: Appling
Posts: 186
M.O.C. #20840
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3791RD Water Leak
DW noticed water dripping ever so slowly outside and below the doors to the battery compartment in the nose of the RV. When I loosen the screws that retain the molding in that area the water drips faster for 15-seconds or so and then stops. After several hours water will begin dripping again. We do have a splendede washer/dryer combo in the bedroom closet (RV nose) which is above and forward of the leak. I ran the washer and checked for leaks both during the wash/rinse cycle, and the drain cycle. No visible leaks, no moisture on the water or drain lines, and no water in the drain pan. Looking through the cut-out in the wall behind the washer I can see that the insulation below the washer in the nose of the RV at the very bottom, which is the horizontal section of fiberglass in the nose by the hitch, is wet. Again, only the bottom couple of inches of insulation is wet. The ten or so inches of insulation above the bottom few inches is dry. Based on this observation I think that the water may be coming from elsewhere and pooling here. The bathroom is the next closest water source but I cannot detect a leak there either? A roof leak is not the source as we haven't had rain for almost two weeks. Based on the above info, does anyone have any advice on what the source of the leak may be? Thanks
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Wayne & Karen
2017 3791RD, MORryde SRE4000 w/ X Factor
2017 Ford F350 Lariat, CC, LB, PSD, DRW, 4WD, Curt Q24
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09-28-2020, 08:32 AM
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#2
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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If you've used the black tank flush during that time the backflow preventor that's frequently located under the bathroom sink could be your problem. Many of us have replaced or eliminated it.
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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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09-28-2020, 11:49 AM
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#3
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,892
M.O.C. #24086
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I had a missing screw from the vinyl under the hittch pin over hang (bedroom closet). When it rained it would drip out the hole.
Check the decor caulking on the roof along your cap. I had a couple of very small bubbles that were leaking. Once I re caulked the drip stopped.
Remove a screw or two from under here and shove a mop string up into the holes. It will wick the water down the string.
Pictures show the washer plumbing behind the cap. You can also get to this by removing the covering inside the closet, and the dresser, and the covering left and right of the dresser.
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09-29-2020, 05:50 AM
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#4
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Montana Fan
Join Date: Nov 2017
Location: Appling
Posts: 186
M.O.C. #20840
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Based on my above stated actions and the fact that I had already replaced the black tank back-flow valve, I believe that the gray tank may have filled during the rinse cycle, and overflowed . The gray tank will remain open during washer use going forward!!
__________________
Wayne & Karen
2017 3791RD, MORryde SRE4000 w/ X Factor
2017 Ford F350 Lariat, CC, LB, PSD, DRW, 4WD, Curt Q24
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09-29-2020, 06:11 AM
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#5
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Montana Fan
Join Date: Jul 2015
Location: Edgerton
Posts: 218
M.O.C. #17678
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Quote:
Originally Posted by wecker1
Based on my above stated actions and the fact that I had already replaced the black tank back-flow valve, I believe that the gray tank may have filled during the rinse cycle, and overflowed . The gray tank will remain open during washer use going forward!!
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Ouch! Lessons learned...
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09-29-2020, 09:55 AM
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#6
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Montana Master
Join Date: Aug 2020
Location: Keller
Posts: 525
M.O.C. #26851
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Quote:
Originally Posted by wecker1
Based on my above stated actions and the fact that I had already replaced the black tank back-flow valve, I believe that the gray tank may have filled during the rinse cycle, and overflowed . The gray tank will remain open during washer use going forward!!
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Make sure to form a P trap in your sewer hose when you leave your grey tank valve open. This will prevent sewer gasses (stinky!)from entering your rig through the sewer hose.
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10-14-2020, 10:58 AM
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#7
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Montana Fan
Join Date: Apr 2019
Location: Long Isalnd
Posts: 150
M.O.C. #23929
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Quote:
Originally Posted by Mikelff
Make sure to form a P trap in your sewer hose when you leave your grey tank valve open. This will prevent sewer gasses (stinky!)from entering your rig through the sewer hose.
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Wouldn’t the trap for each of the plumbing fixtures take care of that? I have my Montana as a seasonal most of the year with the grey water valves open, never experienced any smell. I close them during travel and a few days prior to my flushing the black tank.
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10-14-2020, 11:23 AM
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#8
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,774
M.O.C. #12947
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The problem is not the individual fixtures but is the tanks themselves. When you have a valve open, sewer gases enter the tanks from the park's sewer system and will exit out the vent pipes at the roof and then can get into the rig through open ceiling vents or open windows or doors. When walking around an RV park, it is quite obvious where the rigs are that have their valves open.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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10-14-2020, 03:54 PM
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#9
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Montana Master
Join Date: Aug 2020
Location: Keller
Posts: 525
M.O.C. #26851
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Quote:
Originally Posted by rohrmann
The problem is not the individual fixtures but is the tanks themselves. When you have a valve open, sewer gases enter the tanks from the park's sewer system and will exit out the vent pipes at the roof and then can get into the rig through open ceiling vents or open windows or doors. When walking around an RV park, it is quite obvious where the rigs are that have their valves open.
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Exactly true. Making a P trap in your sewer hose is super easy and good insurance against those stinky sewer gasses.
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10-18-2020, 06:19 AM
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#10
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Montana Master
Join Date: Jan 2018
Location: Northville, NY
Posts: 814
M.O.C. #21158
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And as a bonus, the P trap in the hose also shuts off an open path into your rig for critters or insects.
__________________
Jim B
2017 Lariat F-350 FX4, CC, SB, 6.7 PSD 4WD
2018 MONTY 3731FL, at our private winter site in GA
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