To provide an evaporation fuel processing system capable of processing the evaporation fuel regardless of a level of an intake negative pressure, and preventing the deviation of an air-fuel ratio.
A pump body 12 of a fuel pump 10 has two stages, the fuel in a fuel tank 1 is sucked into a pressure tank 20 through a suction filter 13 in the first stage, the fuel in the pressure tank 20 is sucked and pressurized through a suction filter 14 in the second stage, and the fuel is forcibly fed to an engine side from an fuel delivery pipe 100. The pressure tank 20 is sealed. A pressure control valve 52 is opened when the pressure in the pressure tank 20 is over a predetermined pressure to communicate the fuel tank 1 and the pressure tank 20. A canister 30 stores the activated carbon for adsorbing the evaporated fuel in the fuel tank 1. A pressure pump 40 sucks and pressurizes the evaporated fuel in the canister 30 and discharges the same into the pressure tank 20 to dissolve the evaporated fuel into the liquid fuel in the pressure tank 20.
KOYAMA NOBUHIKO
MURAMATSU TOSHIHIKO
KOJIMA SUSUMU
TOYOTA MOTOR CORP