A fuel injector is nothing but an automatically monitored valve. Fuel injectors are part
of mechanical system that injects fuel into the combustion chambers at regular
interval. Fuel injectors are capable of opening and closing many times in a period of
one second. In recent years carburetor was used for fuel delivery, but now fuel
injectors have almost entirely replaced the carburetors.
Various Schemes or types of Fuel Injection
Let us discuss some of the injection schemes briefly:
Throttle body injection is the simplest kind of injection scheme. Like carburetors,
throttle body injector is located on the top of the engine. Throttle body injectors are
very much in resembles with carburetors except in its working. Like carburetors it
does not have fuel bowl or metering jets. In this kind of injectors the fuel is directly
transferred to all of the combustion chambers or throttle bores.
Continuous injection, as the vary name suggest that there is a continuous flow of the
fuel in the continuous injectors. The entrance of the fuel in to the cylinders or tube is
controlled by intake valves. There is a continuous flow of fuel at variable rate in
Central port injection (CPI)
This injection scheme uses a special type of valves called "poppet valves." Poppet
valves are the valves used to manage the entrance and ejection of the fuel intake and
exhaust fuel to the cylinder. It sprays fuel on each intake with the help of tubes
attached to a central injector.
Multi-port or Multi point fuel injection
One of the more advanced injection type nowadays is termed as"multi point or multi
port injection." It is a dynamic type of injection which contains a separate fuel injector
for each cylinder. In multi port injection system, all the injectors spray fuel
simultaneously without any delay. Sequential multi point injection is one of the most
advanced mechanical setup, which allows each injector to spray the fuel instantly
before the cylinder ignites. Hence, with the sequential multi port injection the driver
will get a rapid response time.
Modern fuel injection scheme is quite a complex computerized mechanical system,
which is not confined only to the fuel injectors. The whole process is supervised by a
computer and different parts react according to the given instructions. There are a
number of sensors sending the crucial information to the computer to be adapted.
There are different sensors like controlling the flow of fuel to the monitoring of the
Though, the system is much more complicated but the working of the different parts
is very précised. It helps to control the oxygen level and fuel flow, help avoiding the
unnecessary flow of the fuel in the engine. Fuel injector gives your vehicle the
potential to perform with high level of accuracy.
You might be interested in learning how does fuel injection work? and also how to
change the fuel filter for a ford f-250.