What type of fuel injection sprays fuel into parts of the intake manifold before intake valves?

The correct answer is multipoint injection. This type of fuel injection system functions by delivering fuel into each cylinder's intake manifold just before the intake valves. The primary advantage of this system is to optimize fuel atomization and air-fuel mixing, resulting in improved combustion efficiency and engine performance.

Multipoint injection utilizes individual fuel injectors at each intake manifold runner, which allows for more precise control over the fuel delivery to each cylinder, enhancing the overall engine responsiveness and efficiency. This method is distinct from direct injection, where fuel is injected directly into the combustion chamber, or from other systems that may not target the specific positioning of the injectors as precisely as multipoint injection does.

Understanding the nuances of different fuel injection systems is crucial for automotive appraisal work, as it affects how vehicles perform and their overall fuel efficiency.