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the vehicle experiences a low fuel level alarm
If driving continues after the fuel gauge alarm, the fuel pump will not be able to cool sufficiently and may burn out the fuel pump motor. When the oil pump is working, gasoline flows through the electric motor, which can fully ensure the heat dissipation of the motor, so there is no danger of burning the motor.
The rotor of the oil pump motor. It can be seen that it is tightly wrapped. The material of this layer is usually resin material. Due to the fact that the motor rotor has a coil, the coil is wound with enameled wire and contains a certain amount of gasoline. After dissolution, if the enameled wire is soaked in gasoline for a long time, it will inevitably fall off, which will cause a short circuit and burn the coil. Therefore , it is necessary to protect the coil. In addition, the surface of the coil is not flat and the rotational resistance is greater , so after winding, the rotor shape can be very circular and the rotational resistance can be minimized . As is well known , the heat source of the oil pump motor is the coil . At this point , the coil has been wrapped in a thick layer , and the heat dissipation effect can be imagined.
The gasoline provided by the oil pump is not actually fully used by the engine, but is continuously circulated between the fuel tank and the engine. Due to the fact that the oil pump draws a large amount of oil during operation and the engine cannot use too much gasoline , the car's fuel supply system has a return line . The high-pressure gasoline provided by the fuel pump is first delivered to the fuel rail . The fuel rail is connected to the fuel injector . There is a pressure regulating switch on the other end of the fuel rail . It can ensure the normal injection pressure of the fuel injector and allow the use of excess fuel . Return to the fuel tank through the return line. When the engine is operating normally , the temperature of the engine is about 90 degrees Celsius, and the fuel supply pipeline is located next to the engine , so the temperature of gasoline will increase as it passes through the engine and returns to the fuel tank.
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