Poulan 2150 w/ walbro wt324 carb fuel line...

Question

I am assembling new fuel lines, the old ones are gone. In the poulan 2150 there is a small and large hole.On the walbro wt324 there are two attachments points.I have a primer bulb with a small and large attachment places.The small line can only go from the tank to the primer bulb, atleast that is only small conections.Thanks for your help.