Fuel Injection Systems: Overview: Notes

There are 2 types of fuel injection systems, direct fuel injection and port fuel injection. The direct fuel injection system delivers fuel directly into the engine cylinder. The port fuel injection system delivers fuel into the intake manifold ports where the fuel is mixed with air and enters the engine cylinder through the intake valve. On some engines, both the direct fuel injection system and the port fuel injection system are used to deliver fuel to the engine. During heavy acceleration or higher engine loads the direct injection system is used to deliver fuel to the engine. During idle or low engine load conditions the port fuel injection system is used to deliver fuel to the engine.

For additional information on the direct fuel injectors, refer to ENGINE CONTROL COMPONENTS .

For additional information on the fuel injectors, refer to ENGINE CONTROL COMPONENTS .