Fuel pump replacement generally does not need to drain the fuel. The function of the fuel pump is to suck the fuel from the fuel tank, pressurize it and deliver it to the fuel supply pipe, and cooperate with the fuel pressure regulator to establish a certain fuel pressure.

Common causes of fuel pump damage:
1. The fuel oil level warning light in the gauge is on because the fuel level is too low, and the fuel pump motor cannot be sufficiently cooled and lubricated, which will cause the motor to overheat or even fail to work. If this is the case for a long time, it will cause the gasoline pump to be damaged faster;
2. The gasoline quality is too poor, there are impurities or foreign matter in the gasoline, and the gasoline pump is too dirty. These impurities enter the internal bearing of the gasoline pump, which will accelerate the wear of the bearing and cause the gasoline pump to be damaged;
3. The gasoline filter is not replaced for a long time, the gasoline filter is clogged, and the gasoline pump is under high load for a long time, which causes the gasoline pump to be damaged.

Automobile fuel pump has the following functions:
1. Automobile fuel pump is an important part of automobile engine electronic gasoline injection system;
2. Its basic function is to provide a certain fuel pressure for the engine fuel injection system;
3. From this point, it can be seen that the quality of the electric fuel pump and its working conditions will directly affect the working conditions of the vehicle's fuel injection system.