I still have the original charcoal canister on my 73 Duster, with the one hose coming up from the tank still attached to it. Id like to remove it, to clean up the engine compartment (no smog needed). Can I cap the line coming up for the tank, or should it still be left open for venting?

I am also thinking of running a fuel vapor return line, by purchasing a filter with a return orface and running a line back to the tank. Can I run the return line into the existing tubing coming up from the tank to the charcoal canister? What else would need to be done?