Which of the following is a type of electronic fuel injection system?

• A. Electronic Unit Injectors
• B. Mechanical Distributor
• C. Pneumatic Injector
• D. Fuel Pump Injector

Answer: (A)

Electronic fuel injection relies on an electronic control signal to meter fuel precisely. Electronic Unit Injectors fit this approach because each cylinder has its own injector assembly that contains the injection pump and nozzle, and the engine control unit sends electrical pulses to open the injector for a precise duration. That per-cylinder electronic actuation lets the ECU regulate both when injection occurs and how much fuel is delivered, giving accurate fuel metering and timing.

In contrast, a mechanical distributor uses cam timing to manage fuel delivery without electronic control, a pneumatic injector operates based on air pressure rather than an electronic signal, and the term fuel pump injector isn’t a standard electronic configuration. So the Electronic Unit Injectors are the type that embody electronic control of fuel delivery.