How do you replace gas-tank filler-neck on a 2000 Toyota Echo?

To replace the gas-tank filler neck on a 2000 Toyota Echo, first, ensure the vehicle is safely lifted and secured. Remove the rear seats and access the fuel tank by unbolting any necessary components for clearance. Disconnect the filler neck from the gas tank and any attached hoses, then remove the old filler neck. Install the new filler neck by reversing the disassembly steps and ensuring all connections are secure before reassembling the vehicle.