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Electric fuel pump quality judgment:
After the electric fuel pump is damaged, the noise is obviously increased compared with the normal time, and can be judged by listening to the sound.
The resistance of the armature winding resistance of the electric fuel pump is generally around 10-20Ω. If the resistance is too large or too small, it indicates that there is a short circuit in the armature winding of the electric fuel pump, the brush is in poor contact, or the winding is broken or broken. . 
Check the electric fuel pump's oil delivery: Remove the electric fuel pump's oil outlet pipe, connect the electric fuel pump's terminal to a voltage higher than 11.5V, and collect the fuel from the oil outlet with the measuring cup. The oil amount within 30 seconds should be not Less than 0.6 liters, otherwise the pump body is a defective safety valve.
The electric fuel pump is a non-repairable part that must be replaced when it is determined to be damaged.