Only 2 hoses connect to the oil separator, one from the valve cover and the other from the air intake. It makes sense when you pull off the manifold.
Remember, you do not need to pull off the injectors, just loosen the fuel line and disconnect the vacuum line for the fuel pressure regulator(hard line), then rest the manifold on top of the engine.

Remove the bolt for the dipstick and the manifold support bracket at the same time. When reassembling, finger tighten the bottom bracket bolt, put the manifold back into position, and then install the top bracket bolt before tightening the bottom bolt.

Clean out the PCT before attaching the nice clean tubing at the air intake.

Klaus
--
The more I learn, the more I forget. So why learn?