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Old 03-10-2019, 02:25 PM   #1
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flushing black water tank

I have a Dutchmen Voltage 3655. I have a side door that has all the escape valves. there is ability to hook up hose to to flush black tank. I hooked up but it will not let water in. there is a statement that says escape valve must be open. i have open black water tank valve. The owners manual isn't telling me enough so I don't know if Im doing it right or not. Does anyone have any suggestions.
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Old 03-10-2019, 03:12 PM   #2
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Originally Posted by McG's Mobile Manor View Post
I have a Dutchmen Voltage 3655. I have a side door that has all the escape valves. there is ability to hook up hose to to flush black tank. I hooked up but it will not let water in. there is a statement that says escape valve must be open. i have open black water tank valve. The owners manual isn't telling me enough so I don't know if Im doing it right or not. Does anyone have any suggestions.

The flush valve may be installed backwards thereby not allowing the water to enter the tank.
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Old 03-15-2019, 08:34 AM   #3
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I think he may be referring to the backflow preventer when he says flush valve being installed backwards
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Old 03-15-2019, 07:07 PM   #4
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I think he may be referring to the backflow preventer when he says flush valve being installed backwards
How do you know if its backwards,, I have a somewhat similar problem
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Old 03-15-2019, 07:16 PM   #5
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How do you know if its backwards,, I have a somewhat similar problem
Water not going into tanks is first clue to me. Either backwards not allowing flow or a bad one
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Old 03-15-2019, 07:41 PM   #6
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Right, backflow preventer protects the water supply in case it shuts off and starts to drain so that no black tank goo is drawn in to contaminate it. When the manual says to open a valve, that is to prevent tank over pressure, though the tanks SHOULD be vented to atmosphere via a roof vent, but not 100% sure the black tank is. You can start the flush, then open the drain, and close it a few times, while it is flushing, but you don't want to leave it closed more than a minute or so, otherwise it could damage the toilet to tank seal.



IOW, water should flow through regardless if the drain is open or closed.
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