Removing gas tank on 68 dart

On my 64, remove the screws that bolt the filler tube to the quarter panel, then remove the ruber gasket that bolts to the floor, then push the filler tube into to tanks an inch or so then drop the tank from below. Once you have lowered the tank a little ways you can remove the filler tube from the tank. Be care not to bend the vent tube on the filler tube.