no, its not that easy to get to. you need to drop the tank or remove the truck bed. its located in the tank and if you do tackle this job, be careful with the connectors on the top of the tank. i've broken a couple on occassion.
i agree with this. the nissan factory pump should outlast the service life of the vehicle as long as you don't let the tank run too dryi wouldnt replace the fuel pump if its good, they will prob sell u a reman thats more prone to failure than ur oem.