For those with Livewell pumps on Stealth series

Is your setup really noisy? Mine is, to the point where I refuse to use it. I pull the drian plug and put a screen in the scupper hole to prevent escapes. I'm just wondering if I have a defective pump?

It works fine, but it sounds like a blender. I checked the inlet, and there is nothing clogging it, and no kinks in the tubing. It sounds more like cavitation vibration than something going on with the impeller.
It much quieter when its out of the water