Quiz: What is the difference between direct injection and port fue September 11, 2025 by Alex Turner What is the difference between direct injection and port fuel injection? Discover more about Vehicle Engine and Automobile at our home page. A) Direct injection sprays fuel directly into the combustion chamber, while port fuel injection delivers fuel into the intake manifold. B) Direct injection uses a carburetor, whereas port fuel injection uses fuel injectors. C) Direct injection is used only in diesel engines, while port fuel injection is exclusive to gasoline engines. D) Direct injection has a lower fuel efficiency than port fuel injection. Submit Answer