Before you take out the fuel tank, drain the pressure, disconnect the battery cable from the negative terminal, and pump the fuel into your approved container to move it off. Disconnect all leads related to the fuel pump and fuel level sending unit, then access the fuel tank on Xterra models by taking off the rear seat and fuel pump/fuel level sending unit cover. Jack up the vehicle and prop it so that it won't move during work. Detach and move aside the fuel filler tube protector and the fuel tank shield using the bolts at the front and back. Unclamp and take apart the fuel tank filler line and vapor line connections from their meeting point with the fuel filler neck and tank. Remove both the fuel supply and return pipes as well as the evaporative emissions canister hose. Put the floor jack under the tank with a wood planking between the jack pad and the tank, and lift it until it holds up the tank. Unbolt all bolts that hold the fuel tank in place, both the front and back bobble bolts. Move the jack down while helping the fuel tank exit the bottom of the vehicle, and take the tank off. When you change the tank or get it cleaned or fixed, make sure you do it correctly. Other tasks will be required when you remove and replace this fuel pump/sending unit. Since clean engine oil acts as a lubricant, simply push the gas line back over the fuel tank, just like you did when taking it off.