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Electric fuel pump.

An electric fuel pump is a device that continuously sucks fuel out of the fuel tank and provides fuel with a specified pressure and flow rate to the fuel system.
Based on the function of the electric fuel pump, we can know that the performance of the electric fuel pump will directly affect the working performance of the engine.
Electric fuel pump is the “heart” of fuel supply system of EFI engine.
There are two kinds of arrangement of the electric fuel pump in the fuel supply system, one is the external type, that is, the fuel pump is connected in series in the oil pipeline outside the fuel tank, and the other is the built-in type, that is, the fuel pump is installed in the fuel tank and immersed in gasoline, so the fuel pump is easy to dissipate heat, low working noise and long service life, so it is widely used.

working principle.
The electric fuel pump is composed of pump body, DC motor and shell. Its basic working principle is that after the DC motor is electrified, the rotor in the pump shell rotates at a high speed, and the section at the lower end of the rotor shaft is combined with the inner hole section of the impeller, so that when the rotor rotates, the impeller rotates in the same direction through the rotor shaft, and the vacuum low pressure is caused at the oil inlet during the high speed rotation of the impeller, and then the filtered fuel is inhaled from the oil inlet of the pump cover. The inhaled fuel is pressurized by the fuel pump impeller into the pump shell and then pressed out through the oil outlet to provide fuel with a certain pressure for the fuel system. The structure of the DC motor includes a permanent magnet fixed on the inner wall of the pump shell, a rotor that can generate magnetic torque after electrification, and a graphite carbon brush assembly installed on the upper end of the pump shell. The carbon brush is in elastic contact with the commutator on the armature rotor, the lead wire is connected to the plug-in electrode of the shell, and the outer ends of the electric fuel pump shell are crimped and riveted to form an undetachable assembly.

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