how can I fix a homelite ST-155 grass trimmer?

I have this homelite ST-155 grass trimmer the fuel lines are missing and there is only one hole in the gas tank with a fuel line with the filter attached to it. The carb has 2 inlets one for the primer and the other for the fuel line. Since there is only 1 hole in the tank how is this fuel system supposed to be hooked up. I have been repairing small engines for a few years and have never seen this kind of hookup and have no idea how to hook up this fuel system.
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