at or near you fuel tank filler neck,,,that is the pipe where you stick the nozzle into when you are at the gas station,,
there are pipes and hoses that connect special controls and other devices that prevent fuel vapors from escaping into the atmosphere and creating more smog.
now a particular part or component in this area has malfunctioned and needs to be repaired or replaced.
this equipment is part of your emission control system.
you will need to take the car to the dealer for a proper diagnosis and repairs can be peformed.