What size is the vent?
I am installing a utility sink in my basement right next to my sewage ejector pit. My plan was to install a drain trap underneath the utility sink drain then use a PVC wye fitting to connect to the ejector vent so that everything from the utility sink drains in the ejector pit and that I do not need to add another hole to the ejector cover. Is there anything wrong with my idea? What would be a better alternative?
It will work. It may have some effect on the pump's operation if the water is hitting the float switch. It may turn it on or off sooner depending on when the sink drains.
So if I run the utility sink drain (with trap) directly to the ejector pit in a dedicated line do I still need to put a vent on the drain and tie it into the existing vent line?
You need to run a vent for the sink trap and tie it into an existing vent 6" above the top of the sink.