Hi Everett~ It is important that the exit chamber be at least 1/2 filled with ink for proper ink flow, which is why the vacuum filling procedure is necessary when filling carts for the first time. If you injected ink into the new LLK cart instead of vacuum filling it, you may be able to correct your mistake by vacuum filling it to get ink in the exit chamber. To do this, the air vent hole must be plugged closed, and simply follow the initial vacuum fill procedure (though there is already ink in the cartridge body).
Please let me know if you have further questions or if there's anything else I can help you with.
Best regards~ Dana