The abbreviation for fuel injection, the system that replaced carburetors for delivering fuel into the combustion chamber. FI systems use high-pressure pumps and electronic injectors to precisely meter fuel based on sensor data. This improves efficiency, emissions, and cold-start reliability compared to older mechanical fuel delivery methods.
We need to check the FI system pressure because it's running way too lean under load.
Related terms
EFI
Electronic Fuel Injection is a computer-controlled system that atomizes fuel into the engine.
GDI
Gasoline Direct Injection is a fuel delivery system that sprays gasoline directly into the combustion chamber.
TBI
Throttle body injection is an early electronic fuel delivery system that sprays fuel centrally before the intake manifold.
Throttle body
A housing containing a pivoting valve that controls the amount of air entering a fuel-injected engine.