The carburetor is a mechanical device which blends the air with the fuel and provides it to the engine for combustion. It is an important part in today’s internal combustion engines. This device is responsible for making the perfect air-fuel ratio for combustion.

This mechanical device came into existence around the 19th century and the automobile pioneer Karl Benz has a great hand in developing it for vehicular engines.  The gasoline engines require the right amount of fuel to burn and provide power. Then whether the engine is at its starting position or running at the top speed, carburetor delivers the same for better performance.


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Need of Carburetor in the main fuel system

The fuel we use to operate the vehicles should be burnt at a proper and correct level. Air is necessary for every fuel to burn because it contains oxygen responsible for combustion. Here the carburetor works as a necessary device which provides the perfect ratio of the air-fuel mixture to run the engine. As per the type of engines, the air-fuel ratio always varies with the requirement.

Watch video on next page to see the working of carburetor- 

Working of the Carburetor

Here is the summary of how a carburetor works

The air flows into the carburetor from the vehicles air intake valve.

When we start the car’s engine, as a result, the choke blocks the top pipe to reduce the amount of incoming air. This is done to increase the fuel content in the air-fuel mixture which enters the cylinder.

Here is a venturi, which is basically a narrow kink. The venturi forces the air flow and in result reduces the pressure.

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The reducing air pressure creates suction on the fuel pipe and as a result, it draws fuel in the pipe.

Now throttle valve spins to open or close the pipe allowing the fuel mixture to pass. When the valve opens it allows more air-fuel mixture to flow in the cylinders and in return the engine produces more power and makes the care to rub faster.

In the following situation, the air-fuel mixture flows down to the cylinder.

The float-feed chamber supplies fuel from the fuel tank in the correct ratio.

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During this process when the fuel level drops, the float chamber falls. This results in the opening of the valve from the top.

Now on the opening of the valve more fuel flows from the fuel tank in result it raises the float and again closes the valve.

While we drive the car, this whole process works continuously and drives the engine.

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