Sewer Ejector Pump Sucks the water from the toilet and possibly the Shower - How to fix?

[jubjub269]

So the ejector pump in the basement is sucking the water out of the toilet and most likely the shower. The fix seems to be connect the drain of the pump directly to the 3" main. Is this correct? If so, would the double wye pictured second to last be the way to go or have two separate 3"x 2" connectors one on top of the other?

https://imgur.com/a/172lAm2

Thanks for the help

 

[Terry]

The toilet needs a vent, and so does the lav and the shower.
Also the sewage ejector pump and basin needs a vent. None of that is shown.
Also, you have the wrong type of coupling going from cast to plastic. There should be a metal wrap on that to prevent the pipes from shifting over time.

 

[Sponsor]

 

[hj]

Even if the sink has a vent, you need one between the toilet and pump connection.