Electronic fuel injection (EFI)

Electronic Fuel Injection (EFI) is a substitute for the conventional metering system which mixes the air and fuel in the correct ratio before feeding it down to the main cylinder to power the vehicle.

Usually in a bike a carburetor is responsible for carrying out this task. But, the downside of using a carburetor is that it has fixed settings and it has certain limitations. To overcome this negative aspect of a new system has been introduced. However, for this brand new system to work, it needs data from several sensors. These sensors include an engine speed sensor, temperature sensor, voltage sensor, throttle position sensor, oxygen sensor and an air flow sensor. The data collected from the various sensors are send to the Electronic control unit (ECU). The ECU makes use of the data provided from the sensors to determine the spark advance, the length of spark and other parameters. Then the exact air fuel mixture for that particular instant is fed into the cylinder which in turn delivers optimum power and clean exhaust. All this process is done continuously and happens many times in every second.

A cross section of a fuel injector is shown below:

Electronic fuel injection

Typical EFI components:

1)     Injectors

2)     Electronic control module (ECU)

3)     Fuel pressure regulator

4)     Fuel pump

5)     Wiring harness

6)     Sensors


1)        Although the electronic fuel injection is much more complicated than a carburetor, it is much more efficient.

2)     Fault finding is easy with the right tools


1)     Higher cost than carburetor.


53 thoughts on “Electronic fuel injection (EFI)”

  1. niteen Reply
    September 2, 2016

    Plz give me more details about this project… It’s a best project for me

  2. yugandhar Reply
    March 1, 2016

    Hello sir the concept of this project idea is very nice and very interesting please kindly forward me the details i want to do my project on this. so please forward me further details and pdf ,documentary thanking you sir

  3. surendar babu Reply
    February 15, 2016

    This is very nice and useful concept… pls send ful details… bcz i try my final yr project

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