I'm installing a qwik-jon sewage ejector in the basement. The 2" discharge liine will tie into existing 4" drain after about a 2 foot lift. My problem...

The only existing vent line I can access is the 1 1/2" vent from the washing machine drain. Is it possible to tie in the 3" vent line from the qwik-jon to this vent, or do I need to run a new vent line? This won't be easy... the existing lines are all behind finished plaster/lath walls. I could possibly cut it out through the foundation at ground level and run it up the outside of the house. What would you recommend?

hackplumber

I'm installing a qwik-jon sewage ejector in the basement. The 2" discharge liine will tie into existing 4" drain after about a 2 foot lift. My problem....

The only existing vent line I can access is the 1 1/2" vent from the washing machine drain. Is it possible to tie in the 3" vent line from the qwik-jon to this vent, or do I need to run a new vent line? This won't be easy... the existing lines are all behind finished plaster/lath walls. I could possibly cut it out through the foundation at ground level and run it up the outside of the house. What would you recommend?

hackplumber

It's far better to flagpole the ejector vent on the exterior of the building than it is to tie it into a vent servicing the drain, waste and vent system.

Listen to Growler, He's giving you good advice.
There's a reason that the manufactures mandate a dedicated vent for the ejector pit. Your house vent's designed to pull air into the vent system one way to relieve suction in the traps. A ejector pit vent's designed to exhaust air out of the pit when fixtures discharge into it and pull air back into it as the pump lifts the discharge up into the sewer. So you see the two vents aren't combatable and should not be merged. Regards, Tom

"anyone have a hole saw that will cut through concrete?"
Why not run the pit vent up over the foundation out and bring it up the outside wall a ways? This is permissible if you keep it away from under windows or AC units. Good luck, Tom,