Evaporative fuel vapor emission control systems

An evaporative emission control canister system, including one or more canisters and comprising:

• a fuel-side adsorbent volume;
• and
• at least one subsequent adsorbent volume having an effective volumetric incremental adsorption capacity at 25° C. of less than 35 grams n-butane/L between vapor concentration of 5 vol % and 50 vol % n-butane as determined by Micromeritics volumetric analyzer, and an effective butane working capacity (BWC) of less than 3 g/dL,
• wherein the fuel-side adsorbent volume and the at least one subsequent adsorbent volume are located within a single canister, or in separate canisters that are connected to permit sequential contact by fuel vapor.

An evaporative emission control canister system, including one or more canisters and comprising:

• a fuel-side adsorbent volume having an effective volumetric incremental adsorption capacity at 25° C. of greater than 35 grams n-butane/L between vapor concentration of 5 vol % and 50 vol % n-butane as determined by Micromeritics volumetric analyzer;
• and
• at least one subsequent adsorbent volume having an effective volumetric incremental adsorption capacity at 25° C. of less than 35 grams n-butane/L between vapor concentration of 5 vol % and 50 vol % n-butane as determined by Micromeritics volumetric analyzer, and an effective butane working capacity (BWC) of less than 3 g/dL,
• wherein the fuel-side adsorbent volume and the at least one subsequent adsorbent volume are located within a single canister, or in separate canisters that are connected to permit sequential contact by fuel vapor.