Alternatively spelt carburetor, a carburetor is a device used to mix fuel and air for ignition in an engine. Fuel is stored in a storage chamber within a carburetor, which also contains a choke, a slow-working jet, the main jet, and venturi-shaped restrictions on air flow.   A carburetor combines fuel with air to make a mixture that's ideal for combustion. A modern car's fuel-injection system limits fuel consumption and pollution because it feeds the cylinders more efficiently.   The carburetor manages the fuel-air mixture perfectly, allowing air and fuel to enter the engine through valves and mixing them at different levels according to the conditions.