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Old 03-23-2023, 10:47 AM   #1
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2016 Montana 3711fl

Every thing I have seen on specs for the grey water is 1-90 gal tank. My unit has 2 grey water dump valves one for the kitchen sink and one for the bathroom. You can only take about 3 showers before the bathroom one is full including using the bathroom sink to wash hands. Anyone else will this model and year have this problem?
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Old 03-24-2023, 03:29 AM   #2
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they are probably two 45 gallon tanks we had a similar setup on our Raptor toy hauler.
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Old 03-24-2023, 02:01 PM   #3
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Posts: 38 Buy yourself one of these and turn it into one 90 gallon tank.
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Old 03-24-2023, 05:07 PM   #4
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Something doesn't sound right. If you have a 45 gallon holding tank you should get way more than 3 showers. Look up Navy showers. If you actually use that much water and you have hookups, leave your drain valve open. Water seeks its own level. If you bathroom sink is not draining due to a full tank, then your floor should be wet from your shower drain overflowing. It's common to have bathroom sink drain into the grey tank.
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