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10-10-2022, 07:20 AM
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#1
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Seasoned Camper
Join Date: Jan 2022
Location: Ashland
Posts: 64
M.O.C. #30303
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Black Tank Flush
I have two 44 gallon black tanks on my 2021 3761FL
I can only get a flush on the rear black tank pull handle. What is the water connection for circled in red? Thanks
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10-10-2022, 09:31 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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Might be the tank flush for the other tank. Have you tried it?
__________________
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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10-10-2022, 09:36 AM
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#3
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Montana Fan
Join Date: Apr 2011
Location: Castle Rock
Posts: 248
M.O.C. #11369
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Does not that say FILL?
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10-10-2022, 03:11 PM
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#4
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,945
M.O.C. #5651
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Yea, I think it is the fresh tank fill.
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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10-10-2022, 03:21 PM
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#5
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Established Member
Join Date: May 2021
Location: aiken
Posts: 10
M.O.C. #28817
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I have a 2021 3761fl, the other connection is the flush for the second black tank flush. On mine the one on the left is the rear black and the one on the right for the front toilet.
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10-10-2022, 06:27 PM
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#6
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Seasoned Camper
Join Date: Jan 2022
Location: Ashland
Posts: 64
M.O.C. #30303
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Interesting. I tried it this morning and it made a weird low pitched noise so I turned it off. Thought maybe it was filling my potable water tank. I ended up closing my knife gate valve at end of line and opening both black handles. I was able to get water back into half bath black tank. I will try that other one tomorrow. I learn Sooooo much here from you guys !!!
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Thanks
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10-10-2022, 08:11 PM
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#7
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,945
M.O.C. #5651
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Quote:
Originally Posted by seminolecoop
I have a 2021 3761fl, the other connection is the flush for the second black tank flush. On mine the one on the left is the rear black and the one on the right for the front toilet.
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So with 2 black tank flush lines, the normal coach input and the fresh tank fill, how does this work with only 3 input lines???
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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10-11-2022, 02:34 AM
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#8
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New Member
Join Date: Sep 2022
Location: St. Cloud
Posts: 7
M.O.C. #31618
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Split
The flush line could split and flush both simultaneously?
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10-11-2022, 05:29 AM
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#9
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,137
M.O.C. #25165
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The word "Fill" you see is describing turning the black knob downward. In the picture, it is pointing at "Normal Flow" which would send city water pressure through the rig. Turn that black knob down toward the "Fill" position, and you are filling your fresh water tank using the same city water inlet.
The water inlet just below the "Fill" and to the right of the first tank flush with the hose connected is your second tank flush inlet. To confirm this, drain your second black tank then leave the valve open. Turn on flow to the inlet in question and you should see water coming out of your sewer outlet, hopefully through a clear connector, not directly on the ground. 
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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10-11-2022, 07:37 AM
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#10
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Seasoned Camper
Join Date: Jan 2022
Location: Ashland
Posts: 64
M.O.C. #30303
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Wow. I feel like an idiot. Again. �� for this forum. Hope the �� can be removed��
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Thanks
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10-11-2022, 07:45 AM
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#11
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,160
M.O.C. #6433
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No need to be concerned about asking that question. The labeling in the convenience centers is typically confusing, but even more so in yours.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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10-11-2022, 07:59 AM
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#12
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,137
M.O.C. #25165
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As Bill said, the labelling is confusing on most rigs.
The only dumb question is the one not asked.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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10-11-2022, 09:34 AM
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#13
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Montana Fan
Join Date: Apr 2021
Location: everywhere, USA
Posts: 280
M.O.C. #28634
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we have the exact same rig
That port you have circled is the rear tank flush, looks like they forgot to label it. It will make a strange noise when you apply water to it, I believe it is the rinse nozzle in the tank. Both of mine do that when i am flushing the tanks.
__________________
2021 Montana 3761FL, 9 LIFPO4 batteries & 1700 watts of panels w/ Multiplus II 3K inverter and 30amp DC to DC charger from truck. 8k Dexter axles w/ Kodiak disc brakes.
2019 6.7 diesel F350 DRW with Banks derringer and 4"exhaust, airlift bags, 25k B & W Companion hitch, 45 gal. aux. diesel tank and 14k Winch, just in case!
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10-11-2022, 10:28 AM
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#14
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Seasoned Camper
Join Date: Jan 2022
Location: Ashland
Posts: 64
M.O.C. #30303
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Oh. My two black tank pull levers must be reversed? When I fill from the front water connection the black water comes out of the rear black pull handle valve.
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Thanks
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10-11-2022, 09:49 PM
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#15
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,945
M.O.C. #5651
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I too am getting old and senile! I knew what the fill switch did and doesn't need a separate input. DUH!
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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10-16-2022, 10:11 PM
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#16
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New Member
Join Date: Aug 2020
Location: Bowling Green
Posts: 8
M.O.C. #26975
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Quote:
Originally Posted by Tree Top Turkeys
I have two 44 gallon black tanks on my 2021 3761FL
I can only get a flush on the rear black tank pull handle. What is the water connection for circled in red? Thanks
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I have the same problem with mine. Your water closet dosen't look like mine though. I have another hose connection and another valve.
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10-17-2022, 01:39 PM
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#17
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Established Member
Join Date: Aug 2022
Location: Orlando
Posts: 34
M.O.C. #31426
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Puzzled as well
Used my 2021 Montana 3761 Fl that I bought used this weekend. I have the same question. The tank flush inlet on the left, I assumed that was for the fresh water tank? The only reason I ask is the inlet on the right says black water 2 tank flush on a sticker underneath the valve? So you're saying the flush valve in the left that says tank flush is for black water tank 1? Does the fresh water tank not have a flush? Thanks.
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Paul & Julie Plaugher
2021 Montana Legacy 3761FL
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10-17-2022, 02:00 PM
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#18
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,137
M.O.C. #25165
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No. There is no flush on the fresh water tank. You can fill it by moving the valve (black lever) to fill, but not a flush inlet. Typically the left tank flush inlet us for the forward black tank and the right one for the rear, but apparently some have been installed backwards so you may have to test that.
__________________
Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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10-17-2022, 07:23 PM
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#19
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Established Member
Join Date: Aug 2022
Location: Orlando
Posts: 34
M.O.C. #31426
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Thanks
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Paul & Julie Plaugher
2021 Montana Legacy 3761FL
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