WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Fuel Injector And Fuel Tube Removal & Installation
Courtesy of NISSAN MOTOR CO., U.S.A.
CAUTION:
Apply new engine oil when installing the parts as specified to do so.
Do not remove or disassemble parts unless instructed as shown.