what is the difference between carburator to MPFI system?

f i fuel injected . carb goes on top of intake manifold where gas and warm air mixes.

there are lots of differences between an mpfi and a carb engine.

Carbs work amazingly well, considering that they are just basically a "scent spray" device! They have had many years of continual refinement. and they evolved into really quite efficient accurate devices. They have some big advantages over fuel injection, that is of benefit to people that modify cars, or bikes or for people building drag cars / bikes.

Advantages:

Cheap, simple to understand and light! (race use)

Easy to swap some jets to change fuelling characteristics

No electrics or battery required. (Some race vehicles have none or only small battery because of weight considerations)

Work well in most situations

Can be swapped from one engine/car to another pretty easily

More instant throttle response is possible than with Fuel Injection as we don't have to wait for sensors to tell a computer what's happening and wait for it to calculate a result!

Disadvantages:

They can ice up in cool damp weather!

They do not have as accurate control of fuel / air mixture as modern fuel injection so can easily kill catalytic Converters...

Fuel can vaporise or boil in summer making hot restarts difficult.

The essential for fuel draw "venturi" always restricts airflow slightly reducing max possible power

Fuel drop out occurs in the manifolds causing higher emissions and fuel mixture dependent on manifold temperature. Fuel sat in the manifold as condensed droplets goes through the engine largely untouched!

Fuel Injection systems are now almost universal on road cars. The biggest reason for this is the law requiring very tight emission control that usually needs a Catalytic Converter (catatonic diverter, catastrophic inverter or whatever!). These things are rapidly ruined and become ineffective if used with a normal carb system. A carb cannot keep the fuel mixture so "exact" as fuel injection can. A slightly rich mixture ruins the Catalytic converter! The advent of computers makes modern electronic fuel injection possible at a sensible price.

Advantages:

Better mixture control

No "choke" needed for cold starts

Reliability

less "flat spots" than carb system

Higher peak power possible due to no restriction caused by carb venturi

Disadvantages:

Complexity

Less flexible to modification of motor

Re-jetting is impossible and remapping more complex than swapping jets

weight, battery, computer, fuel pump, regulator etc required.

harder to find faults

a carburator just puts fuel into the cylinders, MPFI is a precise metered mixture of fuel to each cylinder, based on what the computer senses.

It is a more precise mixture than sequential fuel injection.

in Carburetor,petrol is evaporated with air from filters and mixture is send to cyllinder while in MPFI ,petrol is injected as multi point fuel injector MPFI in cylinder directly where compressed air mixture is already in cyllinder