* Air in the fuel line. When a new fuel pump is installed, there may be air in the fuel line. This air can cause the pump to make a humming noise as it tries to move the air through the line.
* A faulty fuel pump. A new fuel pump that is defective can also make a humming noise. This could be due to a manufacturing defect or damage that occurred during installation.
* A problem with the fuel filter. A clogged or dirty fuel filter can restrict the flow of fuel to the pump, causing it to make a humming noise.
* A problem with the fuel pressure regulator. A faulty fuel pressure regulator can cause the pump to work harder than it needs to, which can create a humming noise.
If you are hearing a humming noise from your new fuel pump, it is important to investigate the cause to ensure that there is no underlying issue that needs to be addressed.
