Small Engines (Lawn Mowers, etc.): new fuel lines to lawnboy trimmer, fuel hoses, suction side

Question
I need to replace the fuel lines on my Lawn Boy trimmer 1400 CL.
It has a walbro wt 62a carb. My problem is the old lines were so decomposed I don't know how to route the new fuel hoses. There are two fuel hoses from the fuel tank and one hose from the primer bulb. There is a black 90 degree hose barbed fitting  on the carb and two brass fittings on a white plastic manifold attached to the carb. One of the brass fittings makes a squeak sound when vacuum is applied the other brass fitting doesn't seem affected by vacuum or pressure.Where do the 3 lines attach?

Answer
Hi Kevin
 One line from the fuel tank (the line with the filter) runs directly to the carb. Push the bulb while holding a finger over one of the fittings on the bulb. The suction side fitting is where the second line goes to the carb. The other fitting on the bulb is the return line back to the tank. Hope this helps.