Systems and methods for vehicle fuel tank refueling

A method for a fuel system, comprising:

• during a refueling event:
• opening a canister purge valve fluidly coupling a fuel vapor canister to an intake of an engine responsive to a fuel level of a fuel tank transitioning above a first threshold fuel level;
• and
• closing the canister purge valve after flowing a pre-determined amount of fuel to the fuel tank while the canister purge valve is open, wherein closing the canister purge valve includes decreasing a duty cycle of the canister purge valve based on a rate of overflow of fuel from a first reservoir of the fuel tank to a second reservoir of the fuel tank.

A method for a fuel system, comprising:

• during a refueling event:
• flowing fuel to a first reservoir of a fuel tank while concurrently monitoring a fuel level of the first reservoir;
• overflowing fuel from the first reservoir to a second reservoir of the fuel tank while concurrently monitoring a fuel level of the second reservoir;
• and controlling an amount of opening of a canister purge valve based on the monitored fuel level of the first reservoir and/or the monitored fuel level of the second reservoir.

A system, comprising:

• an engine;
• a fuel tank including a first reservoir and a second reservoir;
• a fuel vapor canister fluidly coupled to the fuel tank;
• a canister purge valve arranged along a fuel vapor flow path between the fuel vapor canister and the engine;
• and
• a controller with computer readable instructions stored on non-transitory memory that when executed during an engine-off condition, cause the controller to:
• open the canister purge valve responsive to a fuel level of the first reservoir of the fuel tank transitioning above a first threshold fuel level during a refueling event;
• and
• close the canister purge valve responsive to an overflow of fuel from the first reservoir to the second reservoir being greater than a threshold overflow.