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Old 07-21-2015, 12:25 PM   #1
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1996 28' Excella
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Grey water problem

Our black water tank fills and drains without incident. Our grey water tank fills rapidly and backs up into the shower pan. When draining the grey water it empties quickly (about one-half the time of the black water). I have tried using the Flush King to back flush both but nothing changes. It seems to me that here is an obstruction in the grey water tank preventing it from draining completely thereby giving reduced capacity when camping. Can I back flush the tank with hot water? I had JC rebuild both the grey and black water valves 30 days ago so it's not the valves.
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Old 07-21-2015, 12:39 PM   #2
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Is the vent to the tank obstructed?

What is supposed to be the capacity of the tank. You can purchase an inline water meter and measure how much water goes in before it overflows into the shower.

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Old 07-21-2015, 12:50 PM   #3
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Drain the gray water tank while the trailer is sitting level. Close the valve and
then jack up the passenger side and open the drain again. If additional water flows out they have set the drain line too high causing a trap.

If that is not it drain the tank and then fill it by hand using gallon jugs and keep count. The tank should be a 30 gallon tank that will tell you what the capacity of the tank is.

The gray water tank should take longer to drain since it is draining through a 1 1/2 in line where as the black is a 3 in line and generally has much less fluid in it.
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Old 07-21-2015, 08:42 PM   #4
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Gray water may actually drain quicker since it is more fluid and less chunky! It can move quicker, even through a smaller hole.
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Old 07-25-2015, 10:56 AM   #5
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Sounds like the vent is clogged to me...or it dropped down into the tank putting the opening below the "full" water line. Stick a hose in the top of the vent, turn on the water & clear out any debris that may have accumulated. You can also check to see it the vent tube has dropped from the top - if so, lift it up and reattach it.

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Old 07-25-2015, 11:35 AM   #6
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An interesting point above.

If the vent line has dropped into the tank that would reduce the capacity of the tank and cause water to show in the shower. I have seen this problem on NEW trailers but discounted it as a problem on your older trailer. The principle of "water seeks it's own level"

Go on the roof and make sure the vent line has not dropped below the roof line.
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Old 02-15-2016, 09:03 AM   #7
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Just saw this thread as I am having a similar issue. In my case the gray tank only holds 16 gallons (3.5 inch deep tank from VTS that sits above belly pan). The shower has a p trap but tends to back up before the gray tank is completely full depending on how level the trailer is. It is a pain, but the only solution I have found is to lower the tongue enough to let the tank completely fill and raise it again to drain. Anyone have a better solution?
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Old 02-15-2016, 09:15 AM   #8
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Quote:
Originally Posted by BambiTex View Post
Just saw this thread as I am having a similar issue. In my case the gray tank only holds 16 gallons (3.5 inch deep tank from VTS that sits above belly pan). The shower has a p trap but tends to back up before the gray tank is completely full depending on how level the trailer is. It is a pain, but the only solution I have found is to lower the tongue enough to let the tank completely fill and raise it again to drain. Anyone have a better solution?
Is the gray water tank adequately vented?
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Old 02-16-2016, 07:01 AM   #9
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It has a 1.5 inch vent line at the top.
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Old 02-16-2016, 02:17 PM   #10
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That ought to do it!
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