We bought our house in 2013. There was a sump pit with a non functioning pump from the day we bought it. The basement was flooded in 2011, which I'm guessing is when the pump stopped working (a considerable amount of water from what I understand).
I finally got around to replacing the pump. I removed the old, rusty pump and replaced it with a new one. I followed the instructions provided by the manufacturer. My issue isn't with the pump or the installation, but rather the existing plumbing to/from the pump. When I added water to the pit, the pump turned on, but instead of discharging the water out into the yard through the discharge pipe (green arrow), it came spouting out of the top of a pipe that drains into the pump (pink arrow).
That particular pipe has a plastic tube feeding into it that runs from the furnace (or ductwork). There is a black valve for that pipe, but if I close it, water comes out the top of the pipe.
Is this setup correct? I don't see how any sump pump would have worked given this setup. I'm way out of my depths here and I need some help.