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What is the purpose of placing the electric fuel pump inside the fuel tank?

1 Answers

JoyRose

07/29/25 10:58pm

The purpose of placing the electric fuel pump inside the fuel tank is to pump the combustion gasoline from the fuel tank into the fuel line and maintain a certain pressure to supply the fuel injector and cold start valve. Its function is to transport fuel from the fuel tank to the engine in the gasoline or diesel engine fuel supply system. Electric fuel pumps can be divided into roller type, turbine type, rotor type, and side channel type according to their different structures. According to the installation location, they can be divided into built-in type and external type. Principle of fuel pump structural forms: Vane pump (turbine pump) characteristics: The pulsation of oil pressure is small, the operation is smooth, the noise is low, and a pulsation damper is not required in the fuel supply system. It is easy to miniaturize, but the delivery efficiency is relatively low. Positive displacement pump roller type rotor type vane type characteristics: The oil pressure is high, but because the operation is not continuous, the oil pressure pulsation is large. Therefore, a pulsation damper is also required at the outlet end of the fuel pump. The turbine-type electric fuel pump is mainly composed of an electric motor, turbine pump, check valve, and safety valve. When the fuel pump is energized, the motor drives the turbine pump blades to rotate. Due to centrifugal force, the blades around the impeller press against the pump housing, carrying fuel from the inlet chamber to the outlet chamber. As the fuel in the inlet chamber continues to increase, a certain degree of vacuum is formed, sucking fuel from the inlet. The fuel in the outlet chamber continues to increase, and the fuel pressure rises. When it reaches a certain value, the outlet valve opens to output fuel. The outlet valve prevents fuel from flowing back to the fuel tank when the fuel pump is not working, maintaining a certain pressure in the fuel line to facilitate the next startup.

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