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09-06-2004, 10:17 AM
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#1
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Montana Fan
Join Date: Mar 2004
Location: Bristol
Posts: 396
M.O.C. #1269
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black water capacity
Can anyone answer this question: in a 3400RL, when the black water is completely full, is there an overflow valve that (lookout neighbor!)releases pressure or, in a worst case, does the water back up to the toilet bowl? Since we can't trust the meter, I was wondering what a worst case scenario might entail.
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09-06-2004, 10:26 AM
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#2
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Montana Fan
Join Date: Apr 2004
Location: farmingdale
Posts: 298
M.O.C. #1351
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HI our 3400 fills until it shows in the flush. Then we dump. Guage is worthless. Dan
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09-07-2004, 12:24 AM
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#3
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Montana Master
Join Date: May 2004
Location: Napanee
Posts: 3,440
M.O.C. #1493
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When you can see the black water in the toilet bowl. IT IS FULL. The guages can be used as a guestimate only. We usually pump out once a week when we are setup for the winter.
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09-07-2004, 03:57 AM
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#4
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Montana Master
Join Date: Nov 2002
Location: Bakersfield
Posts: 5,316
M.O.C. #15
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After a few trips you will learn how much you're using the tanks. As stated by Bill and Ann you can use the gauges as a "guestimate only". Enjoy your unit and dump often. HamRad
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09-07-2004, 09:41 AM
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#5
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Montana Master
Join Date: Jul 2003
Location: Clearwater
Posts: 10,917
M.O.C. #420
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To me, the gauges in the black tank are totally worthless. I rarely ever dump the black tank without a thorough flushing and still the gauges say the tank is full. Get to know the sounds the flush makes and you will know when to dump. When flushing I pay attention to the sound made as the load lands in the tank. I can tell by the sound as to how close to full the tank is.
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09-17-2004, 03:03 PM
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#6
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Montana Master
Join Date: Nov 2002
Location: Oceanside
Posts: 20,028
M.O.C. #20
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On our 3295RK, when the tank is just about full there's a "plop" splashback of the flush water when you trip the slide. That's my clue to dump. Usually I then close the gray valves and add shower water that night and dump the next morning. A couple of times the black tank has come up to just below the slide in the toilet. That's rather full so I try to dump when I see the splashback. I think that splashback is probably because the vent is covered at that point but that's just a guess. It's just flush water splashing back, not tank contents, by the way.
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09-25-2004, 11:35 AM
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#7
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New Member
Join Date: Sep 2004
Location: Powder Springs
Posts: 5
M.O.C. #2049
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I agree that the black water guage is basically useless. We have a 2004 2980RL and a cousin has a 2002 2955, and both guages read full all the time, even after repeated flush-outs. We just "look and listen".
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09-25-2004, 07:44 PM
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#8
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Montana Master
Join Date: Nov 2002
Location: Oceanside
Posts: 20,028
M.O.C. #20
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I think that's a general problem with those gauges. THey're the same one used in a majority of RV's, including all four of those we've owned. Surely there's a better way.
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