Evaporative Emission Control Sytem?EECS

Does anyone have a diagram of where the three lines that come off the charcoal filled canister go? Or an idea of where to look? I have one line that has come off somewhere that goes to the Charcoal canister. Or maybe even a website that might show the diagram? It's on a 1992 s-10 blazer 4.3 vortec.

Autozone page has a vacuum diagram with your lines.
The firstone is from the fuel tank, one more for the motor vacuum, in mine, comes from a thermal valvle, the third one is for purging.