Yes you need a pump to feed the skimmer. The idea is the skimmer can sit anywhere. NOT in the sump. so in theory you could have it plumbed across the room or on a self away from the sump. This is why you need a pump. you need to get the water to the skimmer. Bubble king also makes the more popular in sump skimmer in the same capacities as the external.
In my pictures you can see a red pipe coming off the red dragon pump. this is the input of the skimmer. I will be plumbing a MAG 5 to this intake pipe
I hope I answered your question. if not i can clarify further
J
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