Both fuel and oil tank caps are self-locking against loss. To release press downwards and turn the cap to the left (anti-clockwise) and lift the cap off. Half-way between the fully tight position and the "lift off" position there is a third safety locking position designed to prevent accidental loss of the cap. To refit a cap engage the projections on the inside of the cap rim with the recesses in the filler neck. Press the cap down and turn hard to the right (clockwise) until tight.