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Old 07-21-2011, 01:00 PM   #29
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I agree with DKB SATX something down stream of the black and grey tank valves is blocking the flow. You said when you open the grey valve nothing drained out yet when you open the black valve the overflow in the shower drained away. That means that both the grey tank valve and the black tank valve are operating and water is flowing from the shower pan through the grey tank and into the black tank.

There could be a third valve downstream of the black & grey valves. Sometimes owners who are having a problem with leaking valves will just add another valve instead of opening up the belly pan to repair the existing ones.

Stupid question: You did remove the cap off the end of the drain outlet are are connected to a sewer hose, right?

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Old 07-21-2011, 01:04 PM   #30
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I wasn't even going to ask if the problem was on the outside of the valves.

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Old 07-21-2011, 01:06 PM   #31
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Everything outside the dump pipe is clear.
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Old 07-21-2011, 01:18 PM   #32
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Originally Posted by Capt Quirk View Post
The valve handle is still firmly screwed on, but I don't feel any "action". Whatever is going on, everything drains into the shower, and doesn't want to leave there. What is directly under the shower drain? I'm thinking a long rod and a hammer will "fix" this...
Be sure the valve is opening. If it seems like there's no "action" the rod may have come off the valve stem. You may have to cut an access hole in the belly pan to get to the valve and reattach it. If you are sure the valve is open you should be able to work a snake up into the greywater tank -- it's only a few feet from the drain outlet. That may clear a blockage or if it hits the valve blade you'll know for sure that the valve is shut.

The shower is the low point in the greywater system so you'll see water back up into it anytime the tank is full.

Greywater can look and smell pretty gross so that may be all you're seeing in the shower. Or you may have a blockage in the Y pipe.

In any case running a snake up in there should reveal a good deal of information.
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Old 07-21-2011, 02:53 PM   #33
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You could just shove a piece of old garden hose or the like slowly up the pipe. Be careful! jim
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Old 07-21-2011, 03:26 PM   #34
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Just a quick review on how a “normal’ trailer sewer system should function seems in order.

All the gray water sources, as in sinks and shower, should flow into a common tank. This tank has it’s own vent up a hidden chase to the roof. There is a bit of plumbing involved, and mostly it is just standard house stuff. Gravity is the force.

Only the toilet empties into the black tank. In fact, there is no plumbing between the two. The toilet is flange mounted to the top of the black tank. There is a vent pipe for the black tank to the roof as well.

To my knowledge the only connection between the two tanks is the drain tube connection. Downstream of the dump valves, the two tanks flow in a common 4” pipe that leads to the hose connection for a common dump point.

In this heat, the gray water can become quite putrid. Especially with a little food matter washed down the kitchen sink drain.

With no “action” on the gray drain valve, my guess is you simply have a fully gray tank, with rotten water backing up into the shower. No black involved. The only fix would be to get under the trailer and open the pan to service the valves. There may be a small opening there now, with a patch held on be screws or the like. Like I say, just my best guess.

Best of luck.
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Old 08-16-2011, 12:14 PM   #35
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I am very curious on this issue... did this get fixed? and what was the finding?
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Old 08-17-2011, 06:09 AM   #36
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The issue is still an issue. Can't climb under, can't fix it from above. The water has leaked out from the belly pan, and the shower is empty. We don't use the inside plumbing these days, we have the outhouse and working on building the outdoors shower house and an outdoors kitchen. Just more incentive to get a house built, so I can gut the trailer.
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Old 08-19-2011, 02:28 PM   #37
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Oh, that sounds bad then. Well i hope that you are able to get some reliable plumming in your life,
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Old 08-19-2011, 06:26 PM   #38
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I have a Western Wilderness camper where the shower drains into the black water tank. Seems like your unit has a similiar configuration. One way to tell would be to put some dye or RV antifreeze into the shower drain, close the gray water valve first before pouring the liquid in the drain, open the black and see if it comes out the outlet pipe.

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Old 08-20-2011, 04:05 AM   #39
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Uzzah, it is bad enough to keep me from fixing it. But, reliable plumbing we have... it is called an out house

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