Is the fuel pump for a 99 Toyota Corolla accessible from the trunk or is it a tank drop?

It is actually accessible from inside the car. First disconnect the battery. Open up the driver's and passenger's side rear door and then go to the driver's side rear. Pull up on the front of the back seat and pull it out of the car. There should be a panel that you can see that you can use a screwdriver to pry up(it is only held down by RTV). Disconnect the electrical connection from the top of the unit. Unscrew the bolts around the top of the fuel filter/pump unit and pull it out. That's it.