I Need To Know The Exact Position On The Fuel Lines On A Craftsman Gas Trimmer/weedeater Once The Fuel Lines Are Inside The Fuel Tank How Far Down Do I Push Them In?

Exact position should not matter too much. You don't want the fuel line to be resting on the bottom of the tank. If it did, there would be the possibility of picking up heavy objects (dirt).

I'd use within 1/4" of the bottom of the tank.