I changed the gas fill cap and reset the light, but after 1 day, the light came back on. Where is the charcoal canister located and what lines can I also check for leaks

Thanks

 

The EVAP canister is located on top of the fuel tank. You have to drop the tank to get to it.
Rusting of the filler neck for the fuel tank has been reported as a source of EVAP system leaks. You should look for that.