Fuel pump parked up hill

Noise might be "a bit of luck." In the case of OEM, "they," "the thems" can spend time and money to engineer a quiet install.

I mounted my red pump with oversize gromments above and behind the rear axle, hanging from the trunk floor. It was a little noticeable. When I went with the Holley EFI, I moved the pump into the cavity just in front of the rear spring hanger. It's mounted in a rubber pad with a big clamp around it. You can hear it with key on / engine off, but from front seats cannot hear it with engine running. I would guess the trunk floor acts like a sound board.