I have a old toro weed eater and had a new carburator put on it 2 years ago. It has always been hard to start since then. There are 2 fuel line…

i have a old toro weed eater and had a new carburator put on it 2 years ago it has always been hard to start since then there are 2 fuel lines one comes from the primer bubble to the fuel tank and the other goes down the side of the fuel tank and i cannot find where that second fuel line goes please help