I'm not sure about the Murcielago actuator, but I was testing the Aventador 2 wire actuator a couple days ago. Maybe it operates the same way. The fuel flap is pushed in manually to open, and pushed in manually to latch it closed. The actuator is wired to the power locks. Power to the actuator locks the fuel flap. Reverse polarity to the actuator unlocks the flap. If the actuator fails in the locked position, there is a lanyard that can be pulled to unlock the flap.
Not sure if any of this applies to your actuator...