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mkerns12 01-06-2013 06:43 PM

Adventure continues... Drain help
1 Attachment(s)
After some local advise, I was told to drain my sink like the below photo. Sink drains fine but when the sump pump runs, which comes from the left in the PVC, the sink drain bubbles. Any advise on this would be great. As the photo shows, the drain runs from the sink to the sump drain line through the check valve. Thanks for the help!

jagans 01-06-2013 06:52 PM

Do you have a trap under the sink?

mkerns12 01-06-2013 06:59 PM

Yep normal trap under there. The sink has a very short tailpipe.... Not sure if that would matter?

jagans 01-06-2013 07:31 PM

Do you have a standpipe to the left for your sump pump to dump into? Maybe an air break will stop the problem. Check to make sure your drain is clear also.

mkerns12 01-06-2013 07:59 PM

I have a standpipe for the washer to drain into.... Drain is all clear! Keep the help coming!

TheEplumber 01-06-2013 08:06 PM

199 Attachment(s)
Put a vent on the sink line

Jackofall1 01-06-2013 09:01 PM

You really shouldn't be tying the sink drain to the sump line to begin with as sink water is considered grey water and sump water is storm. Whether the sump is to a drainage ditch or city storm, you should be introducing grey water to either.

mkerns12 01-07-2013 05:45 AM

The sump goes into the main drain for the house...

Alan 01-07-2013 09:28 AM

I'm confused which one is which since you said the pump line comes from the left in pvc. :jester::jester::jester::jester:

Ishmael 01-07-2013 09:44 AM

That went from ugly to uglier!

mkerns12 01-07-2013 04:02 PM

Yea I didn't really understand the setup so thought some local advise would be better than going at it myself from what I found on here.... Guess I was wrong! The sump pump is to the left on the horizontal PVC and drains to the right into the main house drain.... I am assuming the PVC running vertical is up posed to be a vent... Runs out the basement window...

mkerns12 01-08-2013 04:19 PM

Any more insight on this? Not sure how to fix and need some help!

jagans 01-08-2013 04:27 PM

The vent runs out the basement window????? Cmon man I just had a hip replacement, and your pulling my leg.

Jackofall1 01-08-2013 04:39 PM

Well let me take a stab at it, when the sump runs the velocity of the liquid passing the "Y" in which the sink ties to, is creating a venturi effect causing the sink line check valve to lift from its seat, when the pressure equalizes the check closes creating a slight back pressure in the upstream section of the sink drain piping causing bubbles of air to rise through the sink trap.

Try running the sump without the check valve in the sink line, my guess that is whats causing the issue that is if there is no other check valve further down the line.

If there is another check valve then you may want to replace it, as it may be causing back pressure on the whole drain line piping you have there.


wrongdave 01-08-2013 04:43 PM


Originally Posted by jagans (Post 1089200)
The vent runs out the basement window????? Cmon man I just had a hip replacement, and your pulling my leg.

I'm guessing it runs through the same window that dryer vent to the left runs through. :thumbsup:

Disconnect the sump pump from your waste pipes and run it outside the house (not through the window though) to a point where it drains away from the house. In many areas it's illegal to run a sump pump into the waste system because it then needs to be treated like waste water. It can also overwhelm waste treatment systems during storms.

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