Patent ID: 6062066
Filing Date: 2000-05-16
Classification: F02D,F02M

Abstract:
A method for determining, prior to initiating filling of a fuel tank, the volume of the fuel tank that does not contain liquid, the method comprising the steps of:placing a vapor supply conduit in sealing relationship to the fuel tank;injecting a known volume of vapor through the vapor supply conduit into the fuel tank;measuring the amount the known volume of vapor increases the pressure of the fuel tank;determining the volume of the tank that does not contain liquid from the known volume of vapor, and the measured amount of pressure increase; anddetermining if the fuel tank is equipped with a vapor recovery canister by measuring a rate at which the pressure of the fuel tank decreases after the vapor is injected, and determining that the fuel tank is equipped with a vapor recovery canister if the rate at which the pressure of the fuel tank decreases after the vapor is injected is within a range of rates that would result if the fuel tank were equipped with a canister.