Why does my bathroom smell that's on a ejector pump system?

Is you ejector pit vented?

Its has to be otherwise the whole house would smell wouldnt it this is a 3 year old house. It only smells in that bathroom. I also noticed today that there is a small pvc pipe comming from the main venting that blows heat or ac throughout the house and it goes down into the ejector well or what ever it is called. Is that normal?

That may be a condensate drain line. Any chance you can take a picture of it? If it is a condensate and it drains to the pit then it must have its own trap, does it?

Ok I uploaded two pics hope they help.

Pics didnt show up. Please try again.

Need to see this small pvc pipe and how it ties into the vent, and also if it has a trap. This could very well be your source of smell. But we need a diagram or picture, or very clear discription of how this drain is run.

Are they showing up I resized them?

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That is a condensate drain and it does not appear to have a trap. It needs a trap to stop sewer gas from backing up nto the furnace plunum. You can make one by cutting the horizontal line and remove a short piece a few inches long, save the piece. Add a 90 elbow to the cut end pointing down, do this on both cut ends. Add two short pieces to the elbows both pointing down, add elbow on the down piece pointing at each other, reinsert your first short piece of scrap. This trap will collect water and make a seal. Howver, this may just be a coincidence and you may still have your smell. If so let us know.

Is this how its suppose to look?

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Yes. And great discription Bob. I will add that Im not a fan of having the drain for the a/c coil go directly to the sewer pit, as when the pump kicks on, it may siphon a small diameter trap. Just install the trap, and see how things go. If you still get a sewer smell, I would suggest capping the line going into the pit, and running the drain to a floor drain (floor drain already will have a trap and vent) or installing a condensate pump for the a/c drain and running it to a convenient drain location (laundry sink, washer standpipe, or even outside, etc. Please let us know how things work out.

PS. I see your pit vent is revented with other vents. You will most likely gets some feedback from folks here, but do know that reventing is acceptable in certain areas, all comes down to the authority having jurisdiction. However, most areas require the vent for the pit to have its own didicated vent up and out the roof, not to mention no drain tieing into the lid of the of the pit (thats why I suggest a condensate pump, or running the ac drain to a floor drain if possible.) Like said, try the running trap on the ac drain first, and if the smell still occurs, we take the next step.