Can you workout too much to the point of causing adrenal fatigue?

No: You can feel tired if you overdo your training but you will not cause adrenal insufficiency.

Stress related: Adrenal fatigue occurs in situations where there is a constant stress on the body either physical, mental or both. The adrenals can not keep up with the body's demands. Physical activity can make you feel tired for good reasons. See http://www.Adrenalfatigue.Org/what-is-adrenal-fatigue for more info.