the charcoal cannister should have a hard line coming in from the gas tank, and another line running to the throttle body. fumes coming from the tank are absorbed and held in the charcoal until vaccuum is pulled by the running engine. vaccuum pulls the fumes from the coal, and into the motor. just cap the lines off. you can completely remove the hardline from the tank, just make sure you have plugged the hole left by the line. plug it with something that is not soluble by gasoline.