Hello,
I believe I have a problem:
A sewage ejector pump was installed, the shower, toilet and sink all drain into the pump basin. The underground drain pipes for these fixtures have a vent that ties into the main line that exits the roof.
There is however a second sink that drains directly into the sewage ejector pump's vent (this 2" vent line run to the outside of the house.)
There is now a faint odor, and I believe it is a 'leak' of the gases from the pump basin into the house because of the sink that drains directly into the pump's vent line.
What should I be looking for and is that truly the cause of the problem?
Here is an image of what I am trying to describe: