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Author Topic: Sink drains way to slow, what to do?  (Read 9639 times)
prov431
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« on: August 12, 2009, 11:08:36 AM »

New pop up, not impressed with the rate of water flow through the sink drain to outside connection. Total length is only about 4 ft. of drain line. (a little long so the sink/counter can flip up & down)
The drain line is the corregated plastic flex tubing, maybe 1/2" or a tad bigger.
I thought of replacing the tubing....any suggestions or tried and true fixes?

Thanks,
Dan
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blw2
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« Reply #1 on: August 12, 2009, 11:23:49 AM »

Search around in here.  there are several discussions strings on this one....
I'll start the summary list;
add a vent to the drain at the point it leaves the PUP and the hose is attached.  There are tons of pictures of this out there...
keep the hose length short
cut the strainer away (the little cage in the sink)
good luck.
« Last Edit: August 12, 2009, 12:50:16 PM by blw2 » Logged

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Christine & David
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« Reply #2 on: August 12, 2009, 11:24:32 AM »

I had the same problem with my pu.  Did three things. 

First I now use a large "Y" hose adapter on my gray water drain.  (Make sure you pay a little extra and get one that has large holes through the shut-off valves)  When I install it, I make sure it is oriented vertical and connect the gray water line to the bottom and a short (about 6") piece of hose to the top as a vent.

Second, I cut the plastic "thingey" out of the center of my drain and use a regular sink stopper if DW needs to keep water in the sink.

Third, I had my DW carefully lower the sink from the stored position while I looked at the drain hose.  I saw the the hose was actually making a large "U" like a "P" trap which was keeping the water from draining properly.  I put the sink in the stored position, cut off enough of the drain hose to remove the "U" and now everything drains like it should.

By the way, the first two steps came from folks here on the forum.  The last I sorta figured out myself.

Good luck
« Last Edit: August 12, 2009, 11:26:17 AM by The Smoores » Logged

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rabird
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« Reply #3 on: August 12, 2009, 11:35:33 AM »

smoores,

Did the first two fix your problem?
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Christine & David
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« Reply #4 on: August 12, 2009, 11:43:44 AM »

Rabird,

They helped but making the drain hose shorter was the real fix.  By the way, I did them one at a time until the problem was solved.
« Last Edit: August 12, 2009, 11:45:17 AM by The Smoores » Logged

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hoppy
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« Reply #5 on: August 12, 2009, 01:29:49 PM »

When all else fails, use a small plumber's helper.   Big Smile

 I vented my drain tube and that did help a little to increase the flow.
 Filling the sink 1/2 way before removing the stopper helps my drain work really fast.
 It could be the weight of the water in the sink that helps break the vaccum in the line.

  Hope this helps ya'
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rabird
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« Reply #6 on: August 12, 2009, 01:47:39 PM »

making the drain hose shorter was the real fix. 

I had the same problem but it was outside.
Shortened hose and got rid of extra traps and the drain works well!
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prov431
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« Reply #7 on: August 12, 2009, 02:14:38 PM »

All great suggestions, thanks very much...I plan to start modding immediately!
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JimmyGator
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« Reply #8 on: August 12, 2009, 04:34:01 PM »

I was using this in tests to improve the drain venting



I then made this after looking at a few suggestions here on gray water drain venting.



Thanks to Xplore This! I think it was...

http://tinyurl.com/r8gjrs
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Jim Florida
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techntrek
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« Reply #9 on: August 12, 2009, 07:06:37 PM »

I did 2 things.  First, reach under the sink and pull the flex tubing UP.  In popup the tubing (after the sink was lifted into place) was kinking down below and pulling it all up helped in a big way.  The second thing I did was to run a length of 2" PVC up to the sink drain, and screwed a 45 degree elbow onto the threaded sink outlet.  Completely fixed the vacuum lock.
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Red Barchetta
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« Reply #10 on: August 12, 2009, 09:04:53 PM »

We dry camp exclusively at least once a month year 'round and after almost 8 years with our PU I have tried;
larger drain hose
larger vent opening on tote
chimney vent tee

What worked however was a simple mod. to the sink drain;
Open up the drain inside the sink (I cut the brace out that held the twist-in basket-style stopper) and buy a $2.00 rubber stopper for when you want to fill up the sink.

That's it.   Cool

The water drains as fast as the water pump/faucet can pour/fill.   Smile
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« Reply #11 on: August 15, 2009, 07:32:23 AM »

I tried the vent and a couple other things but they only helped slightly.  After a not so civil thread with another forum member I had to eat crow because he was right.  With the flip/fold down sink/counters in PUPs, the drain hose has to be a bit longer to accound for the swing action.  This extra hose allows the hose to dip below the outlet connection causing a "trap" kinda like you home.  I've found that by raising the sagging section of hose allows the sink to drain exceptionally well.  Attaching a bungee strap to the sagging section keeps the hose elevated and doesn't hinder movement of the hose when the counter is raised or lowered.  Hope this helps.
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CampingFamily1
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« Reply #12 on: November 14, 2009, 10:04:52 AM »

I tried the vent and a couple other things but they only helped slightly.  ... With the flip/fold down sink/counters in PUPs, the drain hose has to be a bit longer to accound for the swing action.  This extra hose allows the hose to dip below the outlet connection causing a "trap" kinda like you home.  I've found that by raising the sagging section of hose allows the sink to drain exceptionally well.  Attaching a bungee strap to the sagging section keeps the hose elevated and doesn't hinder movement of the hose when the counter is raised or lowered.  Hope this helps.

I was hoping this idea would help but I see under my sink I have a built in trap.  The trap is probably there for people who use "full hook-ups" to a sewer connection that would have harmful gas coming into the popup.

Here is a photo of my trap under my sink (ignore the red little bagel basket in the background)


[size=50]created by picasa2html.com[/size]

So instead, here is the solution we use instead

http://www.popupexplorer.com/forum/index.php?topic=71935.0

Sometimes the trap seems to get clogged with food.  I've found that pouring hot, nearly boiling water down the drain cures that quickly.

« Last Edit: November 14, 2009, 10:25:23 AM by CampingFamily1 » Logged

Unstable Tripod
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« Reply #13 on: November 14, 2009, 10:13:30 AM »

A couple of you have mentioned shortening the hose as a way to prevent the extra looping of hose when the sink is in the upward, usable position.  So, if you shorten the hose, how do you flip the sink down into travel position?

I've never had a drain problem but I am curious.
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JimmyGator
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« Reply #14 on: November 14, 2009, 11:57:39 AM »

A couple of you have mentioned shortening the hose as a way to prevent the extra looping of hose when the sink is in the upward, usable position.  So, if you shorten the hose, how do you flip the sink down into travel position?

I've never had a drain problem but I am curious.

Like you, with the proper venting on the outside, I've not had any issues with draining.
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Jim Florida
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