Patent ID: 6945093

Claim:
A fuel vapor leakage inspection apparatus comprising: pressure means for pressurizing or depressurizing a fuel vapor path and a reference orifice serving as a reference for determining leakage from the fuel vapor path, the fuel vapor path being formed from a fuel tank through an adsorption container to an exhaust device, while the exhaust device is blocking communication between the adsorption container and an intake pipe; pressure measurement means for measuring pressure in the reference orifice and the fuel vapor path; and control means for measuring a path pressure in the fuel vapor path pressurized or depressurized by the pressure means with the pressure measurement means after measurement of a first reference orifice pressure in the reference orifice pressurized or depressurized by the pressure means with the pressure measurement means to compare the first reference orifice pressure and the path pressure with each other to determine the leakage from the fuel vapor path, wherein the pressure measurement means measures a second reference orifice pressure of the reference orifice pressurized or depressurized again by the pressure means in the case where there is a possibility that leakage occurs from the fuel vapor path as a result of comparison between the first reference orifice pressure and the path pressure by the control means, and the control means stops the leakage determination of the fuel vapor path if the amount of a change in pressure between the first reference orifice pressure and the second reference orifice pressure is a predetermined value or larger.