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04-12-2019, 05:42 PM
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#1
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Established Member
Join Date: Aug 2009
Location: hope mills
Posts: 28
M.O.C. #9574
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Water in under belly
I keep getting water in under belly when hooking up and raising front some times water will run out I have check for leaks lower under belly checked all lines is there any way water can get in from rain the last time it happen was in March when packing to leave Fla and and we had been having a lot of rain any one else had this problem always clean water no tank leak been checked can water from rain get in.NEED HELP THANKS 2010 3400RL
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04-12-2019, 06:09 PM
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#2
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Montana Master
Join Date: Apr 2016
Location: Auburn
Posts: 879
M.O.C. #18474
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Rain water blown up from the road can get into the underbelly around the edges. Not that much, but some. Also, in high humidity areas, the tanks can sweat and produce a good amount of water coming off of them.
__________________
2020 Montana 3790RD Legacy EditionOnan, TST TPMS, TrailAir pin, Discs,
2013 F350 DRW 4x4 CC LBViair 10007, Ride-Rites, Westin HDx, 12k Smittybilt
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04-12-2019, 07:23 PM
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#3
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,774
M.O.C. #12947
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I had a leaking grey tank several years ago, and it turned out to be a crack in the ABS tank. I made repairs and also added supports under the black and grey tank. No more issues, even with both tanks full from boondocking. My post on this can be seen at this thread- http://www.montanaowners.com/forums/...ad.php?t=72308
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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04-13-2019, 05:50 AM
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#4
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Montana Master
Join Date: Aug 2009
Location: Grand Rapids
Posts: 1,898
M.O.C. #9561
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not a whole lot of options on why you have water.
I was told that road water can get in the underbelly. but if you are concerned you'll need to drop the bottom and start checking.
good luck
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04-13-2019, 06:31 AM
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#5
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Montana Master
Join Date: Sep 2010
Location: Topsham
Posts: 904
M.O.C. #10761
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We had that a few years ago. It took awhile to find, but it was a hole in the top of our grey tank (shower). Brought our Big Sky to 2 dealers, and it would only leak when a person stood in a certain area of the shower. When our tank was removed it was discovered that Keystone had left a screw on top of the tank during the construction process and as time went on it made a hole... I was not a happy camper. Hope you find where your water is coming in...
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04-13-2019, 07:39 AM
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#6
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Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
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Make sure you check your tank flush. it can leak at the vacuum breaker and run down the lines and into the under belly
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Mocha, one-eyed toothless, hurricane survivor, Pirate dog
2019 20th Anniversary Edition 3701LK
B&W 20K for Ford OEM Puck
2018 Ford F-350 Lariat CCLB PSD DRW KJ5CQH
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04-13-2019, 10:49 AM
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#7
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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I wouldn't worry about it unless it leaks at a time when rainwater is not a possible source.
__________________
2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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04-13-2019, 05:06 PM
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#8
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Montana Fan
Join Date: Oct 2017
Location: Moultrie
Posts: 250
M.O.C. #20747
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Do you have a washer? When the dealer installed our washer/dryer, they plumbed the drain pipe directly into the main three inch drain line. The first time we used the washer when not having the discharge valve open we filled the underbelly with wash water. Didn't realize that wash water was not going into grey tank.
__________________
Frank and Marilyn
2014 3402RL, Sailun S637/Disc Brakes
2015 F350 CC LWB SRW 6.7L PSD FX4
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04-15-2019, 09:58 AM
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#9
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,328
M.O.C. #17894
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The very front seam were the coroplast is screwed to the trailer is not sealed water tight. There is usually a piece of aluminum with the coroplast sandwiched between it and the trailer, screwed in place. Water while towing will get driven into that seam. Take some black silicon and caulk that front seam.
__________________
2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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04-16-2019, 10:18 PM
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#10
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Established Member
Join Date: Oct 2009
Location: Medicine Hat
Posts: 40
M.O.C. #9836
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X2, jeffba said. Had same problem, got rid of leaking anti-siphon valve. Only leaked when flushing black tank.
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04-19-2019, 04:45 PM
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#11
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Established Member
Join Date: Aug 2009
Location: hope mills
Posts: 28
M.O.C. #9574
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Quote:
Originally Posted by kencare
X2, jeffba said. Had same problem, got rid of leaking anti-siphon valve. Only leaked when flushing black tank.
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Where is anti siphon valve I will check it Thanks
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04-19-2019, 09:32 PM
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#12
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Montana Master
Join Date: Sep 2017
Location: Tacoma
Posts: 1,567
M.O.C. #20475
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Quote:
Originally Posted by paphog
Where is anti siphon valve I will check it Thanks
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Depending on what module Montana you have it will be under the bathroom sink or behind the shower wall look under the bathroom sink look for (2) white water lines at the top of the lines will the the valve. Same with the shower but you can only see the lines from behind the back basement wall. a lot have just by past the valve under the floor and a valve on the end of the hose when we flues the black tank.
__________________
Bob & Carol Washington St
2017 HC HM352RL 2018 Dodge 3500 laramie CC LB 4x4
Curt Q25 with puck system, Factory air bags
Happy Trails
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04-19-2019, 05:34 PM
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#13
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Montana Fan
Join Date: Sep 2016
Location: West Melbourne
Posts: 314
M.O.C. #18980
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Mine was lead in through the Coroplast especially along the frame edges. If the coroplast extends beyond the frame, trim it back and seal with black silicone caulk. Worked for my problem.
__________________
Butch and Kathy
2016 3160RL Legacy, Sailun S637, Centramatic Balancers, 2-T105s, Amish Refrigeration, ARPrv, SoftStartRV, FlexArmor roof
2016 F350 6.7L SRW
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04-21-2019, 03:25 PM
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#14
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Established Member
Join Date: Aug 2017
Location: Box Elder
Posts: 30
M.O.C. #20380
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You won't want to hear this response but here goes. We kept wondering how our underbelly coroplast could be sagging as we found no leaks inside anywhere. After cutting (yes, we cut, no issues) we found the black tank support had bent, causing the tank to come partially unattached to the toilet drain so the black water was going everywhere, including into the tank. So we thought we were emptying every week not realizing we had a mess.
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04-21-2019, 04:31 PM
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#15
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Montana Fan
Join Date: Jun 2015
Location: Cedar Park
Posts: 135
M.O.C. #17531
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Quote:
Originally Posted by paphog
I keep getting water in under belly when hooking up and raising front some times water will run out I have check for leaks lower under belly checked all lines is there any way water can get in from rain the last time it happen was in March when packing to leave Fla and and we had been having a lot of rain any one else had this problem always clean water no tank leak been checked can water from rain get in.NEED HELP THANKS 2010 3400RL
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Water can just accumulate in the under belly from rain, washing, or whatever. Dealer told me years ago to drill or cut a small hole in the lowest bulge and don't worry about it.
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04-21-2019, 06:29 PM
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#16
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,328
M.O.C. #17894
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I may be wrong, but bent tank supports are most likely do to traveling with full of near full waste tanks. Trust me when I tell you that these tanks are not well supported and actually can move front to back several inches. We never travel with more that a few gallons of waste water in the tanks.
As mentioned, I have also carefully drilled holes in the low spots in the coroplast covering to let any water out that may get in.
__________________
2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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04-21-2019, 07:58 PM
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#17
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 3,038
M.O.C. #5651
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No holes for me. I kind of WANT to know if water is getting under the rig. Then I can track it down before it gets worse.
__________________
Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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04-22-2019, 06:02 PM
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#18
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,328
M.O.C. #17894
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That's the problem, you don't its happening till its to late. Think driving down the highway, while your underbelly fills up with water and brakes loose and drops onto the axles, then a trailer tire runs over it and yanks the whole shooting match out from under your trailer sending it flying into the path of the vehicles behind you. IMHO you never want to trap water where it is not meant to be.
__________________
2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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04-22-2019, 11:00 PM
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#19
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 3,038
M.O.C. #5651
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beeje, I don't have that problem since I never travel with more than a gallon or 2 in the tanks. I always dump the night before or the morning of driving.
__________________
Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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04-23-2019, 05:48 PM
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#20
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,328
M.O.C. #17894
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The issue is the water does not always come from within the camper. The underbelly can and will collect water from driving in the rain.
__________________
2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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