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Old 09-22-2021, 05:00 PM   #1
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M.O.C. #29719
Unhappy Help draining Black/Grey tanks

I have a brand new Montana High Country 334BH. This model has an extra 1/2 bath in the rear bunkhouse. I did not get a very good run thru on this from the dealer (I assumed it would be similar to my old 5th wheel). I simply do not know how to drain everything. There is a outlet to hook the sewer hose to around the middle/front of the unit then a second one at the rear. In the Water center there is a black and a grey valve, a few feet away from that by the first sewer connection is a small door that leads to another valve. Then, there is yet another valve on the frame, behind the slide near the rear sewer connection. We took it out on it's maiden voyage recently, when it came time to dump, we pulled up to the first connection, pulled the grey in the water center, then the black, then the extra grey one on the frame (I assume is the Kitchen), when finished, pulled up to the rear sewer connection, once again pulled the grey and black in the water center, then the last valve on the frame near the rear. When all was completed the panel read 2/3 full on black2. Is this the correct process for this unit and how do I clear the black2 tank? This is quite a setup, and also why are there valves underneath, these are very uncomfortable to get to when dumping.
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Old 09-22-2021, 07:21 PM   #2
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M.O.C. #12947
Typically, you drain the black tank(s) first, then the grey tanks, so the grey waste water makes the inside of the hoses a little less nasty, than draining the black tanks last. If you know which grey tank contains galley waste, that one probably should be drained before the other grey tank.
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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Old 09-22-2021, 08:14 PM   #3
AZ Traveler
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M.O.C. #20477

First, welcome to the forum!

Your black tank fill indicators are very unreliable and basically useless. It only takes a piece of TP stuck in the tank to give a bad reading. Once you use your rig you will get a better idea of how often you need to dump.
Zack and Donna plus Millie and Ranger
2018 3160RL

"Life is too short to stay indoors, enjoy the ride!"
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Old 09-23-2021, 04:53 AM   #4
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M.O.C. #25165
Once you drain the black and gray in the convenience center, and the galley gray tank, then pull up to drain the rear black tank, you do not need to pull the valves in the convenience center or galley tank again. The rear black tank for the half bath has its own valve. You can either put 2 hoses on the 2 outlets with a wye connector to the sewer or do them separately, but the rear black and the other 3 front tanks don't connect to each other.
Sorry if I misunderstood, but it appears you were saying you moved up and hooked to the rear outlet then pulled the front 3 valves again. Not necessary. Those tanks are done.
Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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