Types of Fuel Supply System in Petrol Engine [PDF]

Download the PDF below!

Hey guys, in the last class, we have discussed Types of Oil filters and Types of lubrication systems in a detailed way. You can check it here and now, in today's article, we will discuss Types of Fuel Supply System in SI Engine briefly.

In automobiles, the basic fuel supply system with petrol engine consists of following components:

  • A fuel tank
  • Fuel pump 
  • Fuel lines 
  • Air cleaner 
  • Fuel filter 
  • Carburetor 
  • Inlet manifold 
  • Supply and return pipelines
Types of Fuel Supply System in SI Engine

Types of Fuel Supply System in Petrol Engine:

The following are the types of systems that have been used for the supply of fuel from the fuel tank to the engine cylinder.

  1. Gravity system 
  2. Pressure system 
  3. Pump system 
  4. Fuel Injection System

Gravity system, pressure system, and pump system make use of the carburetor whereas the fuel injection system does not use carburetor for the Air/Fuel supply.

The Gravity system is confined to two-wheelers only whereas the Pressure and the Vacuum systems are almost obsolete now.

The Pump system is widely used in automobiles and due to certain advantages, the usage of the Fuel injection system is rapidly increasing in modern vehicles.

The detailed explanation of Fuel Supply systems is as follow:

Gravity System:

  • In this system, the fuel tank is mounted at the highest position from where the fuel drops into the carburetor float chamber by gravity.
  • The system is very simple and cheap.

Pressure System:

  • In the pressure system, a sealed fuel tank is used and the pressure is created in the tank using either engine exhaust or a separate air pump.
  • For starting, the pump is primed using hand.
  • It is under pressure thus producing the fuel flows to the float chamber of the carburetor.

There are chances of pressure leak but the advantages lie in the fact that the fuel tank can be placed at any suitable location.

Pump System:

In this system, a steel pipe is used to carry petrol from the fuel tank to the fuel pump, which pumps it into the float chamber of the carburetor through a flexible pipe.

The mechanical pump is driven from the engine camshaft.

However, electrically operated fuel pumps can be placed anywhere, away from the hot engine in reducing the tendency of forming vapor lock and this system is commonly used in present-day cars.

Fuel Injection System:

The petrol injection system has been used successfully in some modern vehicles. The petrol injection system is used in the place of Carburettor so that the desired quantity of fuel and air will reach all the cylinders.

The fuel is atomized by means of an injector nozzle and then delivered into the air stream.

Separate fuel injectors are used for each cylinder while the mixture under different load and speed conditions is controlled either mechanically or now more often electronically and this is the most accurate fuel supply system.

This is an explanation about the Types of Fuel Supply System in the SI Engine in a detailed way. If you have any doubts, you can comment on us from the comments section.


Classification of Chassis
Types of Oil filters 
Types of lubrication systems

References [External Links]:

Media Credits:

  • Feature Image: By Vegavairbob at English Wikipedia, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=12013462
Print Friendly, PDF & Email

About Mohammed SHAFI

Mohammed Shafi is the founder, managing editor, and primary author of Mechanical E-Notes. He is an Assistant Professor (Department of Mechanical Engineering) at the Sreenidhi Institute of Science and Technology. He has a 6 years of vast experience in design, research, and data analysis. Shafi has co-authored two journals 1. Dynamic and Fatigue Analysis on Tillage Equipment  2. Welding Procedure and Testing Analysis on Mixing and Nodulizing Drum.

Continue Reading

Supercharger: Definition, Types, Parts, Working Principle, Advantages and Disadvantages, Applications

Supercharger is an air compressor used for forced induction of air into an internal combustion engine whereas Turbocharger works on the exhaust gases from the cylinder for better efficiency. In this article, I will explain the Supercharger: Definition, Parts, Working Principles, Types, Advantages and Disadvantages, and Applications in a detailed way. Before discussing it in […]

10+ Properties of Molding Sand [With PDF]

The Properties of molding sand are adhesiveness, cohesiveness, flowability, collapsibility, refractoriness, permeability, reusability, Grain size, grain shape, dry strength, Porosity etc.. Before looking at the properties of molding sand or Characteristics , we look into the definition of sand casting. Definition of Sand Casting: It is a process in which the liquid molten metal is […]

Manual Transmission Parts and Function [PDF]

In the last session, we had discussed Epicyclic Gearbox, Overdrive in Automobile and Torque tube drive. Whereas in todays session, we will discuss Manual Transmission Parts and Function in a detailed way. Manual Transmission Parts and Function: Before discussing the Manual Transmission and function , Let's discuss What is Manual Transmission and How does it […]

[Notes] Wheels and Tyres: Definition, Types, Advantages, Disadvantages, and Applications [With PDF]

The wheels and tyres have to take the cushioning effect and the vehicle load so that they can cope up with the steering control. In today's article, I will discuss in detail about wheels and tyres along with its advantages, disadvantages and applications. What is a Wheel? A wheel is a circular object having a […]

Difference Between the Fuel Injector and Spark Plug [PDF]

Hello readers, In the last article, we had discussed the Components and Classification of IC Engines whereas, in this session, we will be discussing the Difference Between the Fuel Injector and Spark Plug in a detailed way along with their definitions. What is a fuel injector? As the name indictes that it injects the fuel […]

What are the Components of an IC Engine?

Hello readers, In today’s article, I will discuss some important components of an IC engine with their functions.  Internal Combustion Engine aka IC Engine is a heat engine which works on either the Otto cycle or diesel cycle. In this type of engine, the combustion of the fuel occurred inside the engine. And produced thrust […]

Types of Axles: Front Axle, Rear Axle and Stub Axle [PDF]

An Axle is a shaft for rotating wheels of the vehicle. One end of the axle is connected to the differential via Sun gear and the other end is connected to the wheels. In the last article, we had discussed Synchromesh Gearbox and Epicyclic Gearbox which comes under manual and Automatic Transmissions. In today's class, […]

Torque Tube Drive: Parts, Working Principle, Advantages, Disadvantages and Applications [PDF]

In the Torque Tube Drive, the spring takes the weight of the body, side thrust, and the remaining i.e.Torque reaction, driving thrust and the braking torque was taken by another member which is called the Torque Tube. In the last class, we had discussed Hotchkiss Drive in a detailed way whereas, in today's class, we […]

Hotchkiss Drive: Parts, Working Principle, Advantages, Disadvantages and Applications [PDF]

Hotchkiss drive is the most widely used type of Rear axle drive. It is also simplest compared to Torque Tube drive. In all the drives which are employed for rear axles, the springs take the weight of the body. Types of Rear Axle Drives: There are many types of drives, out of which two are […]

Overdrive in Automobile: Parts, Working Principle, Advantages, Disadvantages and Applications [PDF]

In general, the speed of the wheel is less than the engine speed. but if you want to increase the speed of the wheel greater than the engine speed, then we need to use a device and that is discussed below. Definition of Overdrive: The device that is used to increase the speed of the […]