Weedeater FX25

[Sawzall61]

Hi Folks,
I am repairing a Weedeater FX25 for my brother. When I got it, the pieces of fuel line and the fuel pick-up assembly were laying in the bottom of the fuel tank. I purchased new line and a new fuel pick-up but I don't know the true lengths of the line as some of the old line(s) are missing and I don't know the original configuration. I'm thinking the larger line and fuel pick-up should go to the bottom of the fuel tank and the smaller line (is this a vent line?) should go just inside of the fuel tank? Any help would be greatly appreciated! Thanks!!
Wayne