[jhv48]

Make sure you plumbed the hoses to the correct spouts. If reversed, it will fill, but not return to the system when pressure is relieved.

I looked at your recovery bottle and only find one inlet spout. And that one is up at the top. In order to be a recovery tank, it should have the inlet at the bottom and the overflow outlet near the top. This one just looks like an overflow catch can. Check out #9133. You'll see two spouts.