FUEL SYSTEM FOR A VEHICLE

A method for controlling a fuel vapor recovery system having first, second, and third canisters and a plurality of control valves includes (i) performing a leak test; (ii) in response to the pressure of the entirety of the fuel vapor recovery system increasing to less than a threshold value from a target vacuum pressure within a predetermined period after obtaining the target vacuum pressure during the leak test, outputting a signal indicating that the fuel vapor recovery system is not leaking; and (iii) in response to the pressure of the entirety of the fuel vapor recovery system increasing to greater than the threshold value from the target vacuum pressure within the predetermined period after obtaining the target vacuum pressure during the leak test, outputting a signal indicating that the fuel vapor recovery system is leaking.