3 bolts at front and 3 at rear hold skid plate in place. If tank is close to empty, no need to drain, but there is a drain plug towards the back end. 3 bolts front and 3 rear hold the tank in place. You can usually unplug the level sender at the back with tank up, fuel pump will need to be disconnected with tank lowered a bit on a pickup, unless you pull the bed off.