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Old 05-03-2012, 09:03 AM   #1
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slow draining black and gray tanks

2007 pace arrow 36D............the black and gray water tanks are real slow to drain ........Is this common for this model motorhome?
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Old 05-03-2012, 09:06 AM   #2
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I wouldn't think so. I'll tell you when I pull the black tank valve on my coach, the end of the stinky-slinky will fly around like a firehose if it's not secure (don't ask how I know). Sounds like a blockage problem to me.
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Old 05-03-2012, 09:37 AM   #3
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Since it is both tanks then it must be something they have in common. One thing you might try is to have someone inside the coach flush the toilet and hold it open while you drain one of the tanks. If there is a big difference in flow then it's likely you have a plugged vent line. If there is no difference then check the outlet where the two tanks connect for blockage. If you find nothing there then the only thing left is the hose and fittings themselves. If everything is clear then I guess it could be the design of your system but I think that's highly unlikely. Like Ramblin said, for most of us, before you open either valve you better be sure everything is hooked up nice and secure.
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Old 05-03-2012, 10:14 AM   #4
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There shouldn't be a big differences between coaches. Are you comparing to a previous coach or has this problem just cropped up?

If both tanks are draining slow, I would suspect a blocked or partially blocked vent pipe....bees nest?

It seems unlikely both tanks would have a drain blockage, especially the grey. If it's difficult to go up top and run a snake down the vent, then you could fill the grey tank. Make sure all traps in the coach have water in them. Then have someone in the coach when you dump. If any drains gurgle, then you have a blocked vent and will have to figure a way to clear it.
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Old 05-03-2012, 10:39 AM   #5
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It is possible to have a partial blockage of the gray tank output pipe; it sometimes is a smaller diameter than used for the black tank even though it exits through the same large pipe. I know this from personal experience. My suggestion is to fill the gray tank with hot water and let it drain. If you think this is helping, repeat a few times.

As for the black tank it could either be blockage or a vent issue. If the vent were blocked I would expect to see the tank "burp" when being flushed. If this isn't happening, then the slow draining is probably due to a blockage.
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Old 05-03-2012, 11:05 AM   #6
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Our gray tank seemed to drain slow until I determined that it is bigger that I have originally thought. I drained slow because it didn't have as much water as I thought it should. Have to try longer showers.
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