Normally the outlet at the top is a vent. It's easy enough to confirm this- open the gas cap, look over to the top fitting and see where it goes. If the line on top has a filter or strainer on it inside the tank then it would be a fuel line not a vent. As a vent it looks like you have it hooked up correctly in the catch box. I'm not familiar with your model so I could be wrong about the black box's function.
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