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08-10-2015, 08:14 AM
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#1
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New Member
Join Date: Aug 2015
Location: Albany
Posts: 2
M.O.C. #17730
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Gray Tanks 2015
I have a new 2015 3440RL Montana. The owners manual leaves something to be desired. I found out that I have 2 gray tanks and one black tank. This is not in the owners manual. It just says I have a 96 gallon gray tank. I knew that the indicator panel had lights for 2 black tanks and two gray tanks. It was until the kitchen sink backed up that I found I had an extra EMPTY valve under my entertainment slideout near the kitchen sink. That is why the owner manual leaves something to be desired. Now I just don't know how big that tank is or how big the bathroom gray tanks actually are without filling the kitchen one with 5 gallon buckets of water until it backs up. Does anybody know this information before I subject myself to this task?
Thanks, Dave form Albany Oregon
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08-10-2015, 09:24 AM
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#2
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Montana Master
Join Date: Feb 2007
Location: Winfield
Posts: 7,327
M.O.C. #6846
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It has been reported by many that the two gray tanks are of equal size.
Bingo
__________________
Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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08-10-2015, 11:16 AM
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#3
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Everyone i've known who took the time to put buckets of water down them to measure found them to be identical.
__________________
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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08-10-2015, 01:10 PM
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#4
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Agree, our experience
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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08-10-2015, 02:19 PM
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#5
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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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Yep, agree with all...approx 45 gal each...shower grey seems bigger and is same size as my black tank. Two black tanks only on two potty models. Manual- generic, you may find something useful in it...but don't bet on it. Tank monitor- worthless or soon to be worthless, with readings not meaning anything. John
__________________
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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08-10-2015, 04:52 PM
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#6
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Montana Master
Join Date: Feb 2008
Location: Hillsboro
Posts: 593
M.O.C. #8238
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Hi Dave from Albany, OR. Terry here, from Hillsboro OR. Yep, as has been said, you've got two grey tanks, the company just lumps them together as a total capacity. And as mentioned, the fresh tank and the two grey tank monitors usually work fairly well. The black tank one though, is worthless. It gets stuff on it, and even flushing doesn't always remove everything. The "burp" method of telling when it's getting close works good. Also, if you listen close, you CAN tell by the noise of the flushing water about how full it's getting as well.
Safe travels.
__________________
Terry and Patsy
Vietnam Veteran, US Navy
2017 3810
2015 GMC Sierra 4X4 3500 SRW
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08-10-2015, 08:01 PM
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#7
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Montana Master
Join Date: Oct 2013
Location: Ogden
Posts: 638
M.O.C. #13862
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Quote:
quote:Originally posted by TAKPAK
Hi Dave from Albany, OR. Terry here, from Hillsboro OR. Yep, as has been said, you've got two grey tanks, the company just lumps them together as a total capacity. And as mentioned, the fresh tank and the two grey tank monitors usually work fairly well. The black tank one though, is worthless. It gets stuff on it, and even flushing doesn't always remove everything. The "burp" method of telling when it's getting close works good. Also, if you listen close, you CAN tell by the noise of the flushing water about how full it's getting as well.
Safe travels.
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The "burp method? Care to expound on that? Thanks!
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08-10-2015, 08:48 PM
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#8
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Montana Master
Join Date: Mar 2012
Location: Redding
Posts: 1,421
M.O.C. #12339
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I think the burp method should be avoided at all cost. I think I will be sick just thinking of it !
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08-11-2015, 02:50 AM
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#9
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
quote:Originally posted by Artemus Gordon
I think the burp method should be avoided at all cost. I think I will be sick just thinking of it !
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You must have a very weak stomach. The burp causes no mess or foul odor. Just member that when it "burps" go ahead and dump........don't keep "burping"! 
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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08-11-2015, 03:16 AM
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#10
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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That is how we do it.
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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08-11-2015, 03:32 AM
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#11
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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The "burp method? Care to expound on that? Thanks!
[/quote]
When the tank gets full enough to block the vent pipe entrance, the liquid will "burp" when you flush because a small amount of air must leave the tank when you flush and that's the only direction left for it.
__________________
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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08-13-2015, 10:51 AM
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#12
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New Member
Join Date: Aug 2015
Location: Albany
Posts: 2
M.O.C. #17730
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Thank You to All That Have Taken The Time To Answer.
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