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The "carburetor" is more properly called a constant-level device. (A carburetor mixes fuel and air.) The float and needle valve maintain the oil level at a set height so there is a constant flow of oil through the regulating valve to the burner "pot". The second float is an emergency "trip" that shuts off the oil if the other float and needle valve are unable to regulate it to a safe level. There are adjusting screws that set the limits for high fire and low fire to a certain specified number of drops per minute, so that the stove will stay lit when the control is set on "low", and not overfuel when the control is set on "high". The owner's manual or a nameplate on the furnace may give these "spec's". Often, the pipe on the furnace into the "pot" will get clogged with crudded-up oil, and stop oil flow into the "pot". Usually, a plug may be removed from a "tee", and a wire run in to clean out the pipe. Also, usually there is a removable screen behind a plug, usually low down on the unit that may need cleaning. Post back if you have specific question beynd what I've posted. (BE CAREFULL, and don't try to relite a hot "pot" that's gone out, or use anything other than the recommended stove oil, or you may get your face burned off!)
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