What is a car gasoline pump
The automobile gasoline pump is an important part of the automobile fuel supply system. Its main function is to suck the gasoline out of the tank and press it to the carburetor float chamber of the engine through the pipeline and the gasoline filter. The working principle of gasoline pump includes two kinds of mechanical drive diaphragm type and electric drive type:
Mechanically driven diaphragm type gasoline pump : This type of gasoline pump is driven by a eccentric wheel on the camshaft. When the camshaft rotates, the eccentric top shaking arm pulls the pull rod of the pump film, and the pump film falls to produce suction, sucking gasoline from the tank, and entering the oil chamber through the oil pipe and the gasoline filter. When the eccentric is no longer jacking the arm, the pump membrane spring expands and pushes up the pump membrane to press the gasoline from the outlet valve to the carburetor float chamber. The advantage of this method is that the structure is simple, but it is greatly affected by the engine heat .
Electric driven gasoline pump : This type of gasoline pump does not rely on the camshaft, but relies on the electromagnetic force to repeatedly pull the pump film. The electric pump can freely choose the installation position, and can prevent air resistance. There are two common ways to install electric gasoline pumps: one is installed in the oil supply line, and the other is installed in the gasoline tank. The electric pump installed in the oil supply pipeline is easy to install and disassemble, but the oil suction section is long and easy to air resistance, and the working noise is large; The electric pump fuel pipeline installed in the gasoline tank is simple, low noise, is the current mainstream .
The working principle of the gasoline pump : when the gasoline pump is working, the flow needs to meet the consumption of the engine operation and the demand of the oil return flow to ensure the stable pressure of the fuel system and sufficient cooling. The maximum oil supply of the general gasoline pump is 2.5 to 3.5 times larger than the maximum fuel consumption of the engine. When the pump oil is greater than the fuel consumption, the needle valve of the carburetor float chamber is closed, and the pressure of the oil pump outlet line is increased, which may shorten the diaphragm travel or stop working .
Maintenance and replacement of gasoline pump : After two or three years of use of the car, due to oil dirt and wear and other reasons, the capacity of the gasoline pump may be reduced, and it needs to be cleaned or replaced. Choosing the right gasoline pump has an important impact on the working effect of the engine and fuel consumption .
The main role of the automobile gasoline pump is to suck the gasoline out of the tank and transfer it to the engine after pressurization to ensure that the fuel system can provide a stable fuel supply. Specifically, the gasoline pump, driven by an electric motor, draws and pressurizes the gasoline in the tank, and then sends it through lines and a gasoline filter to the float chamber of the carburetor, or directly into the intake manifold or cylinder of the engine to propel the vehicle forward.
How gasoline pumps work
The gasoline pump is usually driven by a motor, which uses the high-speed rotation of the motor to drive the impeller to rotate, thereby creating a low-pressure area in the pump body, and the gasoline in the tank is sucked into the pump body and transported to the engine through the outlet line. In order to cope with the difficulty of oil absorption when the oil level is low, the oil pump motor has a certain overload capacity, which can automatically increase the power when the fuel is reduced to ensure the continuous supply of fuel.
Types and design features of gasoline pumps
Gasoline pumps can be divided into two kinds according to different driving methods: mechanical drive diaphragm type and electric drive type. Modern vehicles mostly use electric fuel pumps, which have the advantages of large amount of pump oil, high pump pressure, good stability, low noise, long life and so on. In addition, the fuel pump also has a variety of control functions, such as pre-operation function, constant speed operation function, etc., to ensure that the engine can get a stable fuel supply under different working conditions.
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