Q: How to replace fuel injectors and Fuel Rail in a Nissan Sentra?A: Depressurize the fuel system and disconnect the battery. Remove the intake manifold and detach the fuel supply line and injector connectors. Unbolt the fuel rail and remove the injector clips. Pull out the injectors and discard the O-rings. Replace and oil the O-rings before reinserting the injectors. Ensure the clips snap into place. Installation is the reverse of removal.