Direct fuel injection is characterized by injectors located in the engine head extending directly into the combustion chambers and requires a high-pressure fuel pump. Which option best describes this injection type?

• A. Direct fuel injection into the engine head and combustion chamber
• B. Port fuel injection into the intake port
• C. Indirect fuel injection
• D. Sequential fuel injection into the chamber

Answer: (A)

Direct fuel injection is defined by injectors mounted in the cylinder head that spray fuel directly into the combustion chamber, and it requires a high-pressure fuel pump to deliver the precise, atomized spray needed in that tight space. The description given—injectors extending from the engine head straight into the combustion chambers and a high-pressure pump—matches this configuration exactly, which is why this option is the best fit.

Port fuel injection, by contrast, sprays fuel into the intake port before it enters the cylinder, so it uses lower pressure and mixes with air outside the combustion chamber. Indirect fuel injection uses a pre-chamber or separate area to introduce the fuel before it moves into the main chamber, which is different from injecting directly into the chamber. Sequential fuel injection describes the timing of when fuel is injected across cylinders, not where the injection occurs, so it doesn’t define the injection location the way direct injection does.