What are the common types of fuel injection systems?

The common types of fuel injection systems are primarily categorized based on their operation, design, and application in modern engines. The correct answer highlights several key types that are prominent in the industry.

Port fuel injection involves injecting fuel directly into the intake manifold, allowing for better mixing of air and fuel prior to entering the combustion chamber. The Cummins pressure-time system is a specific method utilized in certain diesel engines, focusing on the pressure and timing of fuel delivery to optimize efficiency. Distributor injection systems utilize a mechanical device to direct fuel to various cylinders at the appropriate timing, while electronic fuel injection employs sensors and a computer to manage fuel delivery, greatly enhancing performance and emissions control.

Understanding these types is essential for recognizing how modern engines manage fuel efficiency and emissions. Other answer choices do mention different fuel injection concepts, but they do not encompass the comprehensive range of systems prevalent in current automotive technologies.