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Fuel enters the carburetor from the engine's fuel tank, which is a crucial aspect of how an internal combustion engine operates. The fuel tank stores the fuel until it is required for combustion. When the engine is running, a fuel pump draws the fuel from the tank and supplies it to the carburetor. In the carburetor, the fuel is mixed with air in precise ratios to create a combustible mixture that can then be drawn into the engine cylinders, where it will ignite and power the engine.

Understanding this process is important as it highlights the role of the fuel tank and the carburetor in the engine's fuel delivery system. The other options provided do not serve as entry points for fuel into the carburetor. The fuel mixture reservoir typically refers to a component that holds a prepared mixture, rather than a source of fuel. The oil sump pertains to engine lubrication and does not deal with fuel delivery. The air intake system is responsible for drawing air into the engine but does not supply fuel.