If same injector(s) is being reinstalled, install new O-ring(s).Apply a small amount of clean engine oil to each injector O-ring. This will aid in installation.Push fuel injector(s) into fuel rail assembly (3) until clip has latched.Install fuel rail. Refer to 14 - FUEL SYSTEM/FUEL DELIVERY/FUEL RAIL - INSTALLATION).Start engine and check for fuel leaks.