Refueling Control Valve Test (Altima)
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2000 Nissan Xterra, 2000 Nissan Sentra, 2000 Nissan Quest, 2000 Nissan Pathfinder, and 2000 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
Remove refueling control valve from fuel tank. See VACUUM DIAGRAMS article. Inspect control valve for cracks. Blow air into port "A". Air should flow freely out of port "B". See Fig 1. Blow air into port "C". Air should not flow. Apply 2.9 psi (.02 kg/cm2 ) of pressure to ports "A" and "C". Air should not escape from port "B". If operation is not as specified, replace control valve. If operation is as specified, test is complete.