The charcoal canister is for vapors only. There isn't fuel that actually is "supposed" to go into them. This looks like someone's idea of an aftermarket electronic fuel pump. Follow the wire up and see where it leads to, I bet 3 to 1 odds that it is a fuel pump that someone hot wired off of the ignition switch. When the key is in the on position it will pump and when it is off the pump is off. What some people will do to get away from using the original manual pumps....GEEZE!!