Fuel vapor processing apparatus

摘要

A fuel vapor processing apparatus of an internal combustion engine for a vehicle comprises a main canister, a sub-canister connected to the main canister in series and located closer to the atmosphere than the main canister is, a first one-way valve through which the fluid flows from the main canister to the sub-canister, and a second one-way valve through which the fluid flows in the reverse direction, the first and second one-way valves being provided in parallel between the main canister and the sub-canister.