7 Components of the Fuel System and Their Functions

Rancakmedia.com – Conventional gasoline fuel system components consist of many components, one of which is the carburetor, fuel tank and others, see below for details.

When it comes to the more traditional method, air and fuel are mixed in the carburetor at the right ratio. The EFI system, on the other hand, relies on sensor information to electrically regulate the amount of fuel used. This makes the process more complicated but also more precise.

Overview of the Fuel System

For car owners, you must have encountered such a thing as a combustion or fuel system. This system is very important for the operation of the car because of the important role it plays.

Overview of the Fuel System

Simply put, a car cannot function properly without a system. Well, there are two kinds of systems on the fuel itself, namely conventional and injection.

Conventional systems often still use a carburetor to mix air and fuel. The fuel is atomized by the injectors in the injection system. Although the injection system may make using fuel cheaper, some people still choose cars with the old system.

The reason is, car with conventional machines have a cheaper price. In addition, traditional techniques are considered to make car engine maintenance simpler.

The fuel tank or fuel tank will contain fuel. The fuel pump pumps fuel, which is then filtered by the fuel filter. Fuel lines are used to convey fuel from the tank to other engine components.

Gasoline Fuel System Components and Their Functions

So on this occasion we will explain the role of the components in the gasoline fuel system in general. Here's the explanation:

Gasoline Fuel System Components and Their Functions

Fuel Tank (Fuel Tank)

The fuel tank in the fuel system functions to accommodate gasoline fuel, which will then be dispersed by other fuel system components so that it can be used as fuel in the engine.

To avoid fuel leakage in the event of a crash, four-wheeled vehicles often have rear-facing fuel tanks. This tank is made of thin but strong steel plates, also coated with rust prevention.

Please note that rust on the tank is very dangerous as rust can block the filter and is more prone to leaks. The fuel tank is not just a full box, inside there is insulation or separator.

The purpose of the separator is to prevent fuel from circulating while the vehicle is operating, which can change the fuel level. The graphic above shows the many components of a fuel tank.

  1. Filter: helps filter the fuel in the tank.
  2. Fuel gauge: serves to measure the fuel level, which will then be converted into digital or analog form on the fuel indicator on the dashboard.
  3. Separators: to ensure that the fuel in the tank remains stable when the car is running.
  4. Drain plug: to drain fuel if needed.
  5. Air hose: fuel will be returned to the tank through the intake channel through the air hose.

Fuel Line

The main fuel line helps transport gasoline from the tank to the carburetor. Hoses and pipes protected from leaks in the event of a crash form these fuel lines, which are often installed under the frame or floor of the car.

This fuel line pipe is made of zinc-plated steel and copper (copper-plated steel). There are also several components made of rubber hose.

There are three fuel lines in the fuel system:

  1. This is the main fuel line from the tank to the fuel station.
  2. The fuel return line from the carburetor to the tank, commonly referred to as
  3. The fuel vapor line takes gasoline vapor from the fuel tank to a single charcoal canister.

Fuel Filter

As the name suggests, the fuel filter serves to filter out dirt or water that may be present in the fuel. This fuel filter is located between the tank and the fuel pump. There are other cars where the fuel filter is built into the fuel tank.

Fuel Filter Fuel Filter

The filter element in a gasoline car's fuel filter can slow the flow of fuel, allowing water and dirt particles with a mass greater than the mass of the fuel to fall to the bottom and settle.

In most cases, this fuel filter cannot be opened, but if the dirt isn't too bad, it can be cleaned. Damaged items cannot be opened and cleaned, so they must be replaced if they are deemed unusable.

The following shows the fuel filter or fuel filter on a gasoline-fueled car. Also read: Fuel Filter Function (Fuel Filter).

Fuel Pump

When the fuel starts, it draws fuel from the tank and pumps it into the radiator, where it is cooled. Mechanical and electric fuel pumps are the two most common types.

The camshaft drives the mechanical fuel pump, while the electric fuel receives power from a battery or charging system to power the electric fuel pump.

An electric pump, which is usually installed in the fuel tank of modern vehicles equipped with an EFI system, is used.


The function of the carburetor is to regulate the amount of air and fuel mixture that enters the engine cylinders. One of the parts in the carburetor is the air bleeder which acts as a place to combine fuel and air to produce a fine mist.

Inside the carburetor there are various kinds of systems where this system functions to produce a combination of air and fuel according to the needs of the engine, so that its use is more efficient. Also Read: Carburetor Functions in Cars and Motorcycles

To better understand the carburetor, you can read the following page entitled "Carburetor Working System". In this article, the carburetor system and how it works is discussed.

Charcoal Canister

Due to increased pressure in the tank caused by increased temperature in the internal tubes, charcoal canisters are used to temporarily store gasoline vapors that would otherwise be wasted in the carburetor float chamber and emission line.

This stored gasoline vapor will flow into the intake manifold, which will then reach the combustion chamber. In order for this charcoal canister to use gasoline vapor instead of wasting it, it is recommended to place it in the combustion chamber. Only a limited number of carburetor vehicles are equipped with this particular component.

Fuel Meter or Fuel Indicator

The fuel meter is usually positioned on the dashboard of the car. The fuel meter's job is to tell the driver the amount of fuel in the tank, so the driver can estimate and not run out of gas.

Fuel Meter or Fuel Indicator

The fuel gauge in the fuel tank sends a signal to this fuel gauge, which is then converted to analog or digital form.


The fuel system is very important to the operation of the car because of the important role it plays. The fuel tank, fuel filter, fuel lines and fuel pump are also part of the fuel system.

EFI relies on sensor information to electrically regulate the amount of fuel used. The fuel tank is a cylindrical box-shaped gasoline container. There are also some components made of rubber hose (rubber hose) to protect against corrosion.

The function of the carburetor is to regulate the amount of air and fuel mixture that enters the engine. The fuel gauge is usually positioned on the dashboard of a petrol vehicle, and the fuel gauge shows the current condition of the fuel tank.

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