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11-21-2020, 04:03 AM
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#1
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Seasoned Camper
Join Date: Jul 2019
Location: South Jordan, Utah
Posts: 70
M.O.C. #24453
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Black Tank Construction
Well I did the unforgiveable two days ago! We lost water in the State Park that we are staying in and I wanted to flush out the system before re-connecting the lines. WELL - In my haste I left the flush line running and the valves were closed. My neighbors reported hearing a loud pop. Needless to say we had a sewage problem like no other. After dropping the belly and cleaning everything with a power washer I put more water into the black tank to see where there might have been some damage to tank or lines. I was unable to identify any leaks! My question is how did so much sewage enter into the belly area and there NOT be an obvious leak.
Is there a pressure relief valve built into the black tank?
__________________
Dave & Marylee
2012 Moutaineer 324RLQ, 2016 Ram 3500 Laramie Megacab 4WD, Anderson Hitch, FTC40 Fuelbox, TruXport Tonneau Cover, DISH Tailgater, TST TPMS, Furrion camera system
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11-21-2020, 05:39 AM
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#2
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Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
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it may be on the top of the tank. Tanks used to be made as 2 pieces and they glued on a top to teh tank
__________________
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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11-21-2020, 06:23 AM
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#3
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,707
M.O.C. #7992
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Many on this forum have reported them to leak where the pipe into the tank is not properly sealed/glued. You will only observe that when you overfill the tank. That's when I observed mine leaking. I had got distracted while back flushing the tank. Did nothing as it would be difficult to get to and repair. Just quit overfilling the tank.
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2006 3000RK
2009 Ram 2500
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11-21-2020, 06:24 AM
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#4
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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That's my bet, a two piece tank. Keystone installs these tanks not in accordance to the manufacturers recommendation. Search the forum and you'll find plenty on this subject.
__________________
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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11-22-2020, 10:16 AM
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#5
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Montana Master
Join Date: Mar 2015
Location: Gardnerville
Posts: 1,252
M.O.C. #17163
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The tank must be removed.. ours split where they glues the top to it..its on top..
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11-22-2020, 10:17 AM
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#6
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Montana Master
Join Date: Mar 2015
Location: Gardnerville
Posts: 1,252
M.O.C. #17163
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Should make keystone pay for new ones.. im fed up with the problems..
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11-22-2020, 11:26 AM
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#7
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Montana Master
Join Date: Jul 2020
Location: Battleford
Posts: 627
M.O.C. #26690
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Quote:
Originally Posted by Montana Man
That's my bet, a two piece tank. Keystone installs these tanks not in accordance to the manufacturers recommendation. Search the forum and you'll find plenty on this subject.
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I don't know about prior years, but the 2021 models use a 1 piece rotocast tank...
https://www.keystonerv.com/innovatio...-wheel-chassis
And, as to manufacturer recommendations, do you have info on where Keystone is not installing properly?
Thanks,
Brad
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11-22-2020, 12:37 PM
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#8
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Montana Fan
Join Date: Jul 2020
Location: ladson,SC
Posts: 201
M.O.C. #26644
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Quote:
Originally Posted by Dee_Dub
Well I did the unforgiveable two days ago! We lost water in the State Park that we are staying in and I wanted to flush out the system before re-connecting the lines. WELL - In my haste I left the flush line running and the valves were closed. My neighbors reported hearing a loud pop. Needless to say we had a sewage problem like no other. After dropping the belly and cleaning everything with a power washer I put more water into the black tank to see where there might have been some damage to tank or lines. I was unable to identify any leaks! My question is how did so much sewage enter into the belly area and there NOT be an obvious leak.
Is there a pressure relief valve built into the black tank?
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seems to me the "BLACK STUFF" should have cascaded out of your roof vent and all over the roof....the loud pop might have been caused by pressure build up due to a clogged roof vent .(either at the roof or at the tank )
sounds like you blew off one of the rubber tank fittings and deposited all over the floor and under....
imho---- i would do a visual and not let this just go unattended.....
even if it cost you some bucks.....better than being a slave to the tank.. not knowing when the next **********
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11-22-2020, 02:07 PM
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#9
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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Quote:
Originally Posted by kowbra
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Mine is a 2016 made in 2015 and it also has rotocast tanks. I don't know if the legacy package has anything to do with the better tanks or not.
My buddy's unit blew 3 of the two piece tanks before we learned what the problem was. I was fortunate enough to speak with someone at the manufacturer that makes those tanks and they said the tanks are not designed to be hung from the flange without support underneath the tank. He actually said they are being installed not according to their recommendations.
__________________
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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11-22-2020, 02:38 PM
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#10
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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 you have the black bas two piece tank, it will more than likely have blown open a foot or so of the flange seal. You have to cut pipes and remove one side support tube to drop the tank and remove it. The tank needs to be totally dry inside to be able to repair it with a product like plasti-mend. Been there, done that with black tank and galley tank. And they do make a loud noise when the seam let's go. I don't know if montana ever supported the tanks under the bottom OR if they just finally switched to a one piece tank.
__________________
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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11-22-2020, 06:28 PM
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#11
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,318
M.O.C. #17894
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I have said it many times on many treads, these 2 piece tank can not handle being over filled or being transported with waste in them. You really have to pay more attention to what is in your tanks and when to dump them.
__________________
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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11-22-2020, 06:52 PM
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#12
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Montana Master
Join Date: Mar 2015
Location: Gardnerville
Posts: 1,252
M.O.C. #17163
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Here is the tank out...]
[/ATTACH]
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11-22-2020, 06:54 PM
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#13
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Montana Master
Join Date: Mar 2015
Location: Gardnerville
Posts: 1,252
M.O.C. #17163
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Are where i cut the pipes... used rubber boots to reattach..
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11-22-2020, 07:01 PM
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#14
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Montana Master
Join Date: Mar 2015
Location: Gardnerville
Posts: 1,252
M.O.C. #17163
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Quote:
Originally Posted by Montana Man
Mine is a 2016 made in 2015 and it also has rotocast tanks. I don't know if the legacy package has anything to do with the better tanks or not.
My buddy's unit blew 3 of the two piece tanks before we learned what the problem was. I was fortunate enough to speak with someone at the manufacturer that makes those tanks and they said the tanks are not designed to be hung from the flange without support underneath the tank. He actually said they are being installed not according to their recommendations.
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LEGACY MEANS YOU GET A REAR CAP, HIGH GLOSS GELCOAT FOR ANOTHER 6000! I do notice when selling the legacy nada or the dealers dont add even tho we paid for it!.. we get no better materials or construction and we get no add when trading or selling..
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11-22-2020, 07:07 PM
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#15
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,318
M.O.C. #17894
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Quote:
Originally Posted by dfb
LEGACY MEANS YOU GET A REAR CAP, HIGH GLOSS GELCOAT FOR ANOTHER 6000! I do notice when selling the legacy nada or the dealers dont add even tho we paid for it!.. we get no better materials or construction and we get no add when trading or selling..
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The Legacy Edition is just another money grab for Keystone to suck money out of your pocket. Our 2011 unit has a rear cap and high gloss gelcoat. We bought it used and it didn't cost me a nickel more for those two things.
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11-22-2020, 07:22 PM
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#16
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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There is no overfilling the tanks. There is either full or less than full. Full doesn't mean overloaded unless the tank is mounted improperly thereby reducing it's weight bearing capacity.
The legacy package is more than a rear cap and high gloss exterior. It isn't for everyone but what it did offer we liked.
__________________
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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11-22-2020, 07:56 PM
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#17
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Site Team
Join Date: Aug 2007
Location: Omaha
Posts: 6,750
M.O.C. #7560
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Mike-- You are wrong about not overfilling the tanks. You can and yours if different entirely from the Dee Dub. Your tanks are one piece molded tanks where his are two piece tanks with a plastic weld and glue attaching the top to the bottom of the tank. The weld/glue is not strong enough to hold when to much pressure is applied inside the tank from overfilling it without the valve being open to let it drain. dfb's pictures show the tank that Dee Dub has and yours is one complete piece not two.
beeje-- the difference between the Legacy and the Montana is the front and rear cap, disc brakes, and the command center to start with. The Legacy is the new name for the Big Sky which was put out of commission several years ago. The new Montana's are the regular Montana from years back but without the back cap. The Montana High Country is now what used to be the Mountaineer.
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11-22-2020, 08:10 PM
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#18
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Montana Master
Join Date: Jul 2020
Location: Battleford
Posts: 627
M.O.C. #26690
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Quote:
Originally Posted by Rondo
Mike-- You are wrong about not overfilling the tanks. You can and yours if different entirely from the Dee Dub. Your tanks are one piece molded tanks where his are two piece tanks with a plastic weld and glue attaching the top to the bottom of the tank. The weld/glue is not strong enough to hold when to much pressure is applied inside the tank from overfilling it without the valve being open to let it drain. dfb's pictures show the tank that Dee Dub has and yours is one complete piece not two.
beeje-- the difference between the Legacy and the Montana is the front and rear cap, disc brakes, and the command center to start with. The Legacy is the new name for the Big Sky which was put out of commission several years ago. The new Montana's are the regular Montana from years back but without the back cap. The Montana High Country is now what used to be the Mountaineer.
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Rondo, thanks for setting the record straight.
And, to add to your list on the Legacy package, it also adds Furrion rear and side cameras, electric cord reel, surge protector and generator prep... and there is no way we paid $6000 for it, in fact it was thrown in almost for no charge. It was a fantastic deal just for the disc brakes alone.
I'm amazed at how much misinformation is casually thrown out. It's not hard to check; just go to the Montana site and spend a few minutes... https://www.keystonerv.com/product/m...y-fifth-wheels
BTW, the information is there also that the tanks are 1 piece rotocast.
And, as to an opinion... I agree with the statement "they don't make them like they used to"... except that in many ways they are not as good, while in other ways they are far better...
Brad
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11-23-2020, 06:30 AM
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#19
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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 do not understand the concept of over filling the tank. Tanks hold X amount of fluid. They have a capacity according to their size and are advertised as such. Nowhere does it say only fill to X percent of capacity. Therefore a 50 gallon tank should hold 50 gallons, etc.
Now, if the tank isn't mounted properly, then that changes everything. Keystone didn't mount the two piece tanks properly nor do they say do not utilize it's full capacity.
__________________
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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11-23-2020, 06:48 AM
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#20
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,318
M.O.C. #17894
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Quote:
Originally Posted by Montana Man
I do not understand the concept of over filling the tank. Tanks hold X amount of fluid. They have a capacity according to their size and are advertised as such. Nowhere does it say only fill to X percent of capacity. Therefore a 50 gallon tank should hold 50 gallons, etc.
Now, if the tank isn't mounted properly, then that changes everything. Keystone didn't mount the two piece tanks properly nor do they say do not utilize it's full capacity.
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It would be true about not causing any pressure on a Ridgid type of tank like steel or aluminum or something like that. But these tanks are plastic and expand and contract quite a bit. So when they are overfilled it literally pushes the top lid off of the tank
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