rough idle fuel related

[digieditny]

well many of you helped me replace my fuel tank strainer. I really thought that was my issue... I drove the car for the first time today below the halfway mark and the rough idle still occurs. It just has to be fuel related... I can't imagine what else it can be. When I fill the tank, it idles perfectly. No issues. Around the halfway point it starts to give me issues.

Could the lift pump be an issue? Does it start acting up when there's less fuel? What else can be related? Can it be something unrelated to fuel even though it acts up depending on fuel level?

The primary, secondary fuel filters and tank strainer have been changed. One of my injectors was leaking so I thought that was it. I changed the hose and still not fixed.

EDIT: Just wanted to add that I still have the old style primer pump. Could that be the issue? Is there a way to test it?