Fuel vapor processing devices

A fuel vapor processing device comprising:

• a housing having a first port for the introduction of fuel vapor, a second port for introduction of negative pressure, and a third port communicating with the atmosphere;
• an adsorption material disposed within the housing,
• wherein a fuel vapor processing device is operable in an adsorption mode and a desorption mode;
• wherein in the adsorption mode, fuel vapor is adsorbed by the adsorption material as the fuel vapor flows through the housing from the first port and toward the third port,
• wherein in the desorption mode, fuel vapor adsorbed by the adsorption material is desorbed from the adsorption material as air flows into the housing via the third port and flows out of the second port;
• a plurality of heaters disposed within the housing and arranged along a path of flow of air from the third port to the second port in the desorption mode;
• a controller configured to control the heaters in the desorption mode, so that the heaters start to heat the adsorption material in a sequential manner in the air flow direction from the third port to the second port and terminate the heat to the adsorption material in the same sequential manner.

A fuel vapor processing device comprising:

• a housing having an atmospheric port and a purge port;
• an adsorption material located between the atmospheric port and the purge port;
• a heater located adjacent to the adsorption material;
• the heater configured to supply heat to the adjacently located adsorption material;
• wherein the heat supplied to an area of the adsorption material near the atmospheric port is terminated before the heat supplied to an area of the adsorption material near the purge port is terminated.