A method for purging a fuel vapor canister, comprising: responsive to a canister load decreasing below a first threshold, reversing a direction of air flow through the fuel vapor canister while maintaining purge air intake at a vent line inlet. By reversing the direction of air flow through the fuel vapor canister, canister regions that would normally retain fuel vapor during a purge event may realize increased desorption when the air flow direction is reversed. In this way, the efficiency of a purge event may be increased and bleed emissions may be reduced.