SI Engine Fuel System (Automobile)

SI Engine Fuel System

The internal combustion engine produces power by burning fuel and converting the chemical energy of the fuel into thermal (heat) energy. SI engines use gasoline (petrol) fuel and generally carburettor fuel system which supplies a combustible mixture of air and petrol at different proportions depending upon engine operating conditions. A carburettor mixes the correct amount of fuel into the incoming air to give the engine a combustible mixture. The fuel supply system is presented in sections 9.1 through 9.8, whereas carburation and carburettor in sections 9.9 through 9.21.
Nowadays many engines in the higher performance category use a fuel injection system instead of a carburettor. This help engine to develop more power to provide higher speed and to accelerate at a greater rate, and also the engine to be more economical in its use of fuel. The petrol injection system is discussed in sections 9.22 through 9.29.


SI Engine Fuel System

The purpose of the fuel system (Fig. 9.1) in SI engines is to store adequate quantity of fuel, and to pump it to the carburettor. The fuel system also prepares the air-fuel mixture for combustion in the cylinder and carries the exhaust gas to the rear of the vehicle. It maintains a rate of flow and pressure sufficient to meet all the demands of speed and load placed on the carburettor and over the full range of gradients, which the vehicle is capable of negotiating. The fuel system has been illustrated in Fig. 9.2. The main components of the fuel system are fuel tank, fuel line, fuel pump, fuel filter, carburettor and air cleaner.

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