A1 - Vapor Supply Line Disconnected

^ With the fuel level below 1/2, disconnect fuel tank vent tube at evaporative emissions canister.

^ Plug the fuel tank vent tube.

^ Using leak tester, pressurize the fuel system through the test fuel tank filler cap.

^ Remove plug from the fuel tank vent tube.

^ Did the fuel system pressure decay?

YES -- Go to A3. A3 - EVAP Control Valve Signal Line Disconnected

NO -- Go to A2. A2 - Canister Inlet And Vapor Tube Blockage Test