The MPFI is a system or method or injecting fuel into internal combustion engine through multi ports situated on intake valve of each cylinder. It delivers an exact quantity of fuel in each cylinder at right time. There are three types of MPFI system, batched,simulatsaneous and sequential.
In the batched MPFI system fuel is injected to the groups or batches of the cylinders without bringing their intake stroke together. In simulatsneous system, fuel is inserted to all cylinders at the same time while the sequential system injections is timed to overlap with intake stroke of each cylinder.
New Engines are equipped with MPFI system. MPFI have a fuel injector for each cylinder. MPFI spray right at the intake valve and valve and provide more accurate fuel metering and quicker response.