Q: How to replace Fuel Injector and Fuel Rail in a Hyundai Santa Fe?A: To replace injector O-rings, first relieve fuel pressure and disconnect the battery. Remove the engine cover, air intake duct, and on V6 models, the upper intake manifold. Disconnect the fuel injectors' electrical connectors and remove the fuel rail. Pull out the injectors from the fuel rail, replace the grommets and O-rings if reusing injectors. Finally, install new O-rings and secure the fuel rail.