<P> In non-diesel internal combustion engines, gasoline direct injection (GDI), also known as petrol direct injection, direct petrol injection, spark - ignited direct injection (SIDI) and fuel - stratified injection (FSI), is a variant of fuel injection employed in modern two - stroke and four - stroke gasoline engines . The gasoline is highly pressurized, and injected via a common rail fuel line directly into the combustion chamber of each cylinder, as opposed to conventional multipoint fuel injection that injects fuel into the intake tract or cylinder port . Directly injecting fuel into the combustion chamber requires high - pressure injection, whereas low pressure is used injecting into the intake tract or cylinder port . </P> <P> In some applications, gasoline direct injection enables a stratified fuel charge (ultra lean burn) combustion for improved fuel efficiency, and reduced emission levels at low load . </P>

Where is the fuel injected in an engine equipped with gasoline direct injection