how much gas is in the tank, i would say try to siphon it out, and put a hydroulic jack underneath and jack it up a little bit. Then once you get all the bolts out then slowly lower the jack so it easier to get the tank out. Gas is heavy and if you dont support the tank its going to be a nightmare to remove the gas tank. Also the fuel pump depends on your plans for the car, if it going to stay stock then get a replacement pump, or if you are going to do mods get a 190lph or a 255lph. That is up to you!!