I have a similar problem like Thomas Hunt’s where we have water gurgling up into our kitchen sink from our sub basement directly below the kitchen whenever the above ground Zoeller drain pump in the box discharges water from our washing machine which discharges into the same line that the kitchen sink is tied into that also drains into the main sewer line that runs under our family room concrete floor and eventually into the outside lateral sewer line.
We didn’t have this problem when we first moved into this house over 30 years ago, but when the City wanted us to no longer have rain water going into their sewer lines, we had to disconnect the existing lines and pumps and add a new above ground “in the box” sump pump so that the only water being discharged into the sewer line is mainly from the washing machine discharge and that’s when the problem began with water gurgling up into our kitchen sink above the basement.
So, a plumber reconfigured my original piping and from what I can see, he tied the Zoeller laundry discharge pump into the same line that my kitchen sink drains into (which is the same hookup as the original hookup when we did not have the water gurgling into the kitchen sink ):; however, the vent pipe from the Zoeller box is connected directly to the outside vent on a 45 degree angle from the box, but I do not see any vent line from the kitchen sink drain line to an outside vent.
I don’t remember how the original venting was done, but this may be the issue.
I called the plumber back about this and he charged me another $80 to run a rod from my kitchen sink through the line to see if a clog was the issue and he said he went through without any clog. But the problem of the gurgling continues. Another plumber told me it may help to run the Zoeller piping through the larger cast iron pipe that is in the same area and bypass the kitchen line, but I don’t know if they really know what their doing or if they’re just trying to run up the bill. One of them said the Zoeller line should have never been connected to the kitchen drain line to begin with.
I tend to think that because I can’t see a vent to my outside vent from the kitchen sink drain line, and because the only vent to the outside vent is through the Zoeller box to the outside vent that the kitchen drain line needs to be vented, unless it is vented and I just can’t see the connection because it’s under the wall somewhere hidden from sight.
Is there a website I can go to see how the correct configuration for this kind of a set up is done or can you draw me one and email it to me?
Thanks for your help.