1, when the pump core is damaged, when the fuel supply system works, then open the key door, there is no sound of gasoline pump running; 2. When the pump body is damaged, the engine cannot start because the pressure relief and fuel pressure cannot reach the specified fuel pressure value and cannot be atomized well. 3, do not wait until the gasoline lamp alarm also do not go to oil, because the gasoline pump is to rely on gasoline to heat conduction cooling, gasoline level is too low, can not play a cooling role, reduce the service life.