Gasoline vapor extraction and storage within a vehicle fuel tank system

A method of controlling an evaporative emissions (EVAP) system of a vehicle, the method comprising:

• commanding, by a controller of the vehicle, a three-way valve of the EVAP system to a first position that fluidly connects an auxiliary vapor canister of the EVAP system and a bottom portion of a fuel tank of the vehicle, wherein the auxiliary vapor canister is distinct from a primary vapor canister of the EVAP system and is configured to store fuel vapor evaporated from a liquid fuel housed in the fuel tank, and wherein the three-way valve is disposed between the primary vapor canister, the auxiliary vapor canister, and the fuel tank;
• controlling, by the controller, at least one of an engine of the vehicle and a purge pump of the EVAP system disposed between the engine and the primary and auxiliary vapor canisters to create a vacuum condition in the fuel tank that draws fuel vapor therefrom and into the auxiliary vapor canister for storage;
• commanding, by the controller, the three-way valve to a second position that fluidly connects the bottom portion of the fuel tank to an atmosphere outside of the EVAP system thereby generating additional fuel vapor in the fuel tank and returning the fuel tank to an atmospheric condition;
• commanding, by the controller, the three-way valve to a third position that fluidly connects the auxiliary vapor canister to the atmosphere;
• and
• controlling, by the controller, at least one of the engine and the purge pump to draw the fuel vapor from the auxiliary vapor canister into the engine.