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Old 07-31-2012, 07:02 PM   #7
SteveC7010
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Join Date: Sep 2011
Location: Northville NY in the Adirondacks
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Gray (or black) holding tanks are not supposed to overflow. If they do, it is a sign of a serious problem. They are fairly simple devices however, so it is almost always a disconnected or broken vent pipe connection, or the inlet is partially disconnected or broken, or the tank itself is ruptured.

It is also possible that the drain connection is damaged. However, if that were the case, you'd have a constant leak of gray water until the tank is completely empty. Add any gray water and it would run right out of the leak.

If you know the tank is completely empty, it is possible to figure out how high up on the tank the leak is located. If it holds any small amount of liquid without leaking, you can rule out the drain.

If it leaks when only partially filled, it may be a rupture or leaking sensor.

If you have to fill the tank completely full before it leaks, that would suggest that either the inlet or the vent is the culprit.

It is also possible that the drain line is leaking.
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