I've got filters in these two lines so that I can more easily fill and empty the tank. I disconnect the green hose from the filter and connect it to the fuel pump line. The muffler pressure line goes to the overflow in the tank. With clear tubing and brightly colored fuel, it can remain connected and still show when the tank is full. But I've provided a connection since I often use almost clear fuel.

You want the lengths to be just long enough.