This section examines basic EFI systems EFI systems use electronically controlled injectors to spray the fuel There are 2 basic systems throttle body injection also called single point injection and multipoint injection Throttle body injection sprays fuel into the air as it passes through to the intake manifold Multipoint injection has an injector for each cylinder which sprays fuel directly into the intake valve port The whole system has a fuel tank to store the fuel a fuel pump to circulate fu