Methods and apparatus are provided for measuring the liquid level within a reservoir based on the buoyancy force that the liquid imparts to a float member. a float member is at least partially submerged into a liquid in a reservoir. The float member is configured, upon being at least partially submerged into the liquid to a depth, to have a buoyancy force exerted thereon by the liquid that is proportional to the depth. The buoyancy force is transferred from the float member to a sensor, via a force transfer mechanism that is movable relative to the float member and the sensor.