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Old 04-28-2015, 11:49 AM   #1
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Sink Drain Not Working Properly

I have a new Flagstaff 206LTD. The sink seems to back up when in use, just barely trickling through the drain line. If I go outside and jiggle the drain line, something releases and it comes pouring out. But then if not used for some time, the problem reoccurs.

I looked through the cupboard under the sink and nothing seems to be kinked.

Any ideas?

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Old 04-28-2015, 12:10 PM   #2
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Location: vancouver,wa
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is yours double sink ? sometimes if I have the stopper in on both sinks it will cause ours to act that way.

Ron & Jan and black dog(Bella)
2011 Ram 3500 crew cab 4x4, 6sp manual,342's 8ft.bed
2014 CC Silverback 29ik
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Old 04-28-2015, 12:14 PM   #3
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Thanks R&J. It's a single sink.
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Old 04-28-2015, 01:15 PM   #4
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Sounds like a vacuum problem. Look for a blockage in the vent pipe.

Good Luck.
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Old 04-29-2015, 11:55 AM   #5
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Location: Lansdale, PA
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I have the next model up, the 208. Ours had a kink in the line under the folding sink as it was pinched between the cabinet when setup one time and that constricted the flow. Also, the regular drain line didn't have a vent, and then necked down to the 3/4 hose as it exited the camper. the 3/4 was fine if it was a short hose, but more than 10 feet and we could really wait for the water to go down the drain. Sounds like that is what you have. By jiggling the line, you are letting air bubbles up the line and helping relieve some of the vacuum.

I replaced that with a PVC adapter and added a vent, then went from there with a piece of sump pump hose which is larger and lets things flow smoothly. Works great now.

Here's a link to a few years ago when I fixed my drain line and connections. You can see there what I did as well as photos of my condition to see if it is like yours.

Sink Drain Fix -->

Outside Drain Fix / Grey Tank -->
2008 Toyota Sienna LE w/ Airlift Airbags
2012 Flagstaff 208 MAC Tent Camper
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Old 04-29-2015, 02:49 PM   #6
Join Date: Mar 2015
Location: California
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I bought my Wildwood used and the previous owner had put the baking soda down the drain but then neglected to flush with water to clear the line. We loosened the pea trap and found it blocked with a solidified chunk of baking soda.
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Old 04-29-2015, 03:44 PM   #7
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If you're using vinyl garden hoses for drain hoses...........step up and buy some good rubber hoses........kink free. I got some 25' black rubber hoses of Amazon. If you get the 90 degree 1 1/2 to 3/4 adapter..........drill a very small hole 1/16th or smaller hole in the top of the bend to act as a small vent for the hose.
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Old 04-29-2015, 08:46 PM   #8
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All the messages are right-on.
A red squirrel hid a black walnut in my bathroom sink (like baking soda, ha, ha). Better I caught it in the pea trap.

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