Refueling One-Way Fuel Valve Test (Altima, Maxima & Sentra)

Remove fuel tank. Drain fuel from tank using a hand pump. Remove fuel filler tube and hose. To check if one-way fuel valve is functioning properly, insert stick into valve. If valve opens when stick is inserted and closes when stick is removed, valve is okay. If valve does not open when stick is inserted and close when stick is removed, replace fuel tank.