Understanding the Fuel Systems of an Aircraft: Gravity Feed System and Pressure Feed Fuel System!

Hello, it's ten o'clock, today we will talk about the

fuel

system

of an airplane, first let's see what a

fuel

system

is. The fuel system stores fuel in the tanks and then supplies this fuel to the engines and APU. It also provides indications such as fuel. The amount and temperature of fuel in the cabin, fuel system varies significantly for each

aircraft

, so I have generally classified them as

gravity

feed

system and

pressure

feed

system. In a

gravity

feed system, fuel will be stored in one or more fuel tanks. Fuel flows through a selector valve. The selector valve can be used to select which tank should deliver fuel to the engine.

The fumes can be taken from only the left tank or only from the right tank, but in normal operations the fuel is taken from both tanks at the rear. It can also be said to cut off the fuel supply to the engine in the event of an emergency after the selector valve, the fuel flows through a filter. This filter is used to remove any impurities in the fuel from the filter. Fuel can be sent to the primer. during the engine start sequence or to the carburetor after the engine has started the carburetor creates a mixture of air and fuel which is sent to the engine to burn as we can see here this is a simple fuel system in this system for fuel to reach the engine.

It must flow downward with the help of gravity, so the fuel tanks must be placed at a higher level compared to the other components, so this type of fuel system can only be used in a single-engine wing-wing

aircraft

. high. Next we will look at the

pressure

feed fuel system this system is widely used in all multi-engine aircraft in this system the fuel is stored in different tanks these tanks can be located in the wings or in the fuselage all these tanks are interconnected to allow The transfer of fuel in the Wigg tank pumps are installed, these pumps are used to increase the pressure of the fuel before sending it to the engine for combustion, they also maintain a constant flow of fuel regardless of the attitude of the aircraft, after the pumps, fuel passes through filters, these filters are used to remove. impurities or particles from the fuel after the filter before the fuel enters the combustion chamber of the engine, it passes through a fuel oil heat exchanger.

This is used to reduce oil temperature and increase fuel temperature, also called wing fuel preheating. The tanks are interconnected and the flow is controlled by a cross-feed valve. This valve allows direct transport of fuel between tanks, which is essential in the event of engine failure, so if there is a failure in the right engine, the film from the right tank is transferred to the left tank. Because? are the cross feed valves, the cross feed valve is also useful in case of failure of both pumps in one tank, in this case the pressurized fuel from the left tank is transferred to the right engine in the cross feed line, the supply to the APU is connected so that the AP can consume fuel from any of the available tanks, we saw failures in the pumps on one wing, if we consider the failure of all the pumps on both wings, then there is a small gravity feed pump which supplies fuel to engines using gravity.

Along with these components, the aircraft fuel system has a refueling fuel line D that is used to fill the tanks with fuel or to remove fuel from the tanks. In addition to the fuel tanks, there is another tank called vent tanks or surge tanks. The tanks allow air to enter the fuel tanks to stabilize air pressure as fuel is consumed. It also provides additional space that allows for fuel expansion due to temperature variation and absorbs few pressure surges in the cabin. Indications are provided for the amount of you in each of the tanks, the fuel temperature, the operation of the pumps and the position of cross feedback, all these components and indications ensure a continuous and safe supply of fuel to the engines.

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