MPFI

MFIS stands for Multi Fuel Injection System. MFIS controls timing along with the amount of fuel that gets injected. In MFIS, air and the fuel is mixed just before the inlet. MPFI system injectors are fitted inside the intake manifold before the valve intake valve. The air fuel mixing take place when injector injects fuel which mixes with air in that time valve starts to open.

MPFI means Multi point fuel injection.MPFI injects fuel into the intake ports just upstream of each cylinder's intake valve, rather than at a central point within an intake manifold. MPFI (or just MPI) systems can be sequential, in which injection is timed to coincide with each cylinder's intake stroke; batched, in which fuel is injected to the cylinders in groups, without precise synchronization to any particular cylinder's intake stroke; or simultaneous, in which fuel is injected at the same time to all the cylinders. The intake is only slightly wet, and typical fuel pressure runs between 40-60 psi.

Many modern EFI systems utilize sequential MPFI; however, in newer gasoline engines, direct injection systems are beginning to replace sequential ones.