General System Description

Fuel Supply System - Components, Hoses, And Lines:

(Figure 3) Central MFI Assembly Parts Identification:

GENERAL DESCRIPTION
The fuel system is controlled by the control module located in the passenger compartment. The control module is the control center of the system. The basic function of the fuel system is to control fuel delivery to the engine under all operating conditions. Fuel is delivered to the engine by the Central Multiport Fuel Injector (CMFI). Fuel is delivered to the injection unit by the fuel supply system, through the filter lines, by the fuel pump, from the tank.

The main control sensor is the Heated Oxygen Sensor (HO2S), which is located in the exhaust manifold. The HO2S tells the control module the amount of oxygen in the exhaust gas, and the control module changes the air/fuel ratio to the engine by controlling the fuel injector. A 14.7 : 1 air/fuel ratio is required for efficient catalytic converter operation. When the control module is responsible for the constant measuring and adjusting of the air/fuel ratio, the fuel injection system is referred to as a "Closed Loop" system.
Several other important engine operation parameters include: engine speed, manifold pressure, engine coolant temperature and throttle position. These parameters determine the "mode" of engine operation.

There are two separate classifications of fuel systems. These include:
1. Central Multiport Fuel Injection (Central MFI).
2. Fuel supply system.