2005 Nissan Xterra fuel delivery system

My 4.0 V6 2005 Nissan Xterra has what seems to be a common problem for owners. The fuel guage was incorrect. I then change the fuel pump module including the fuel level sensor and the sender. My sparks are good and my fuel injectors are firing. I have determined that it must be in the fuel delivery. I want to check for blockage in the fuel filter but cannot determine if one even exists in my Year/Make/Model. Also I want to know what is the easiest way to check fuel pressure since there is no service port on the fuel rail.