if it helps, mine used to only buzz really loud wen i was running low on fuel and stopped sharply or turned harshly etc

but this was also closely followed by the engine cutting out, so that would be a fair old sign of noise due to low fuel lol

is it mounted in the standard fuel pump bracket? and is that mounted using the correct rubbers? iv been in a couple of RS's with homebrew fuel pump holders, and due to no rubbers to dampen the vibration, and bein mounted closer to the floor, the vibrations and noise r vastly increased