When the boot or clamp around the pump is not holding the pump tight, it lets the pump rotate when it starts up. That can twist the pickup hose and the supply and return hoses. Over time that can lead to a loud pump and leaking fuel.

Hervey's power pump which had a foam cover around it because it's diameter is smaller, caused that problem with my car. The foam rotted, broke the pickup hose and tipped sideways. Maybe he uses a better foam now.