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I have seen them at the tracks. They work on air pressure and may or may not have a spring in them as well. When your engine runs, some of the oil is pushed into the cylinder that has a piston with oil on one side and air pressure on the other. When pressures equalize, oil quits filling the sump. There is probably a check valve in the system as well so you can release the oil before you start the engine and the oil will flow in the correct direction. When running, if there is momentary interruption of the oil flow/pressure, this thing discharges (due to pressure imbalance) and fills the gaps until the pump once again takes over. It is also nice that you don't start a dry engine with it. The system can be tied into your ignition so it shoves the oil through the engine before it turns over.
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