fuel lines?

I needed to replace the fuel lines on my 358.797180 leaf blower and vac. My question is there are two lines one is larger then the other.which one does the filter in the tank go on? One is a primer to bullb but they both go to the carb so which one is which that I put the filter on? Usually a person can get a diagram that would show the parts together but I couldn't find it? so I guess I need help! thanks Gerry