1. Remove the fuel tank assembly. (See FUEL TANK REMOVAL/INSTALLATION.)
2. Remove the charcoal canister.
3. Plug the fuel pump unit pipe.
4. Install the pump to port A (check valve (two-way)).
5. Verify that air flows when a pressure of -2.0 kPa {-15 mmHg, -0.6 inHg} is applied to port A with the fuel tank level.
6. Verify that air flows when a pressure of +5.9 kPa {+44 mmHg, +1.7 inHg} is applied to port A.
7. Verify that air does not flow when a pressure of -2.0 kPa {-15 mmHg, -0.6 inHg} is applied to port A.