Important: Visually inspect the fuel injector in order to determine if the upper O-ring was also removed. If the upper O-ring in not removed, remove the O-ring from the fuel rail assembly.
Important: If the fuel injector insulator cups are removed from the cylinder head while removing the fuel rail, new insulator cups must be installed.
Important: Always install new injector O-rings when servicing the fuel injectors. Lubricate the new injector O-rings with clean engine oil.