Fuel injection
![Fuel rail connected to the injectors that are mounted just above the intake manifold on a four-cylinder engine.](/Images/godic/202501/11/Jeep_2.5_liter_4-cylinder_engine_chromed_i2842.jpg")
![An Antoinette mechanically fuel-injected V8 aviation engine of 1909, mounted in a preserved Antoinette VII monoplane aircraft.](/Images/godic/202501/11/Moteur_de_l_Antoinette_VII_Musee_du_Bourget_P10103602843.JPG")
![A 1959 Corvette small-block 4.6 litre V8 with Rochester mechanical fuel injection](/Images/godic/202501/11/1959_Chevrolet_Corvette_C1_V8_283_cui_Fuel_Injection2843.jpg")
2843.jpg")
Fuel injection is a system for introducing fuel into internal combustion engines, and into automotive engines, in particular. On diesel engines, fuel injection is a necessity, whilst on petrol engines fuel injection is an alternative to the carburetor.