Fuel Delivery and Air Induction: Description and Operation

Fuel Delivery System:

- The Electronic Fuel Injection (EFI) system is a multi-point, pulse fuel injection system. This system supplies the engine with the air/fuel mixture necessary for efficient combustion. An air induction system and fuel injection system work in conjunction with an electronic engine control system which consists of various sensors, switches, and an electronic engine control assembly (ECA). All sensors and switches are connected to the ECA which interprets the data it receives and computes when and for how long the injectors are energized.

- The basic requirement of the engine is determined from the data supplied to the ECA by the Vane Air Flow Meter which measures the amount of air being drawn into the engine. Other sensors and switches are used to measure air temperature, atmospheric pressure, coolant temperature, engine speed, and exhaust oxygen content. The various sensors and switches detect any changes in the operating conditions and send signals to the ECA. This permits proper control over the opening duration of the injectors to maintain optimum exhaust emission control and engine performance.

- The fuel delivery system supplies filtered, pressurized fuel to each injector. The system consists of a high pressure electrical fuel pump mounted in-tank, fuel filter, fuel pressure regulator, fuel injectors, fuel pump switch (located in the Vane Air Flow Meter), fuel pump relay, fuel tank, inertia switch and connecting lines.