EVAPORATED FUEL TREATING APPARATUS

An evaporated fuel treating apparatus reduces blow-through of evaporated fuel components from an atmosphere port to an outside and has a fluid circulation passage which includes at one end side a first chamber containing granulated carbon or fractured carbon, and heat storage material and at another end side a second chamber containing granulated carbon or fractured carbon and not having the heat storage material. A delay diffusion chamber is disposed between the first chamber and the second chamber, which does not have activated carbon and the heat storage material therein. An adsorption amount of evaporated fuel of granulated or fractured carbon in the second chamber is set to be not less than 2 vol % and not more than 8 vol % of a total adsorption amount of evaporated fuel of granulated or fractured carbon, and a volume of the delay diffusion chamber is larger than that of the second chamber.