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Not sure how the setup on the s13 is, but on the s14 we have a vacuum-actuated check valve near the manifold, and the charcoal can in the rear bumper, which then has an electronic "vacuum assy" that modulates glow from the tank to the canister.
Now I just went though my engine bay and fuel system and cleaned it up as well. My s14 came with a KA-t, and the previous owner never touched the fuel emissions gear. I found the vent line from the tank to the canister was filled with charcoal, because of the positive pressure from the turbo. So I decided to delete the canister-to-intake line, and the electronic "vac assy" module. Then I ran the black vac-actuated check valve on the tank vent line, but without a vac line. That check valve requires less than 1psi to crack open (tested with a mityvac) in the flow direction. That allows excess tank pressure to escape. You can run that output side to atmosphere or the charcoal can. Heads uo: gas odors will probably become present in either case.
Hope that helps.
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