Computers and Control Systems: Description and Operation

Fig. 6 EGI Control System - Inputs & Outputs:

Fig. 1a Component Operation:

Fig. 1b Component Operation:

Fig. 1c Component Operation:

This system, Electronic Gas Injection (EGI) system consists of the fuel pump, pressure regulator, injectors and, a pulsation damper.
The control unit monitors the various sensors, and then determines the amount of time the injectors are opened.
The injectors are directly supplied with battery voltage through the main relay. The connector for the injectors is yellow with normally aspirated engine and purple on turbocharged engines.