Some other things to check ----
Where ever one of the lines from or to the pump pass through a partition, make sure that the lines are not resting against it. The line will vibrate and the vibration is picked up by the partition, magnified and becomes "louder".
Try putting some pipe insulation in those spots where the lines are close to or touch any wall or partition.
Check the pump and what it is resting on. You might want to take it off and put some rubber "feet" or something similar - cork or even a more solid and insulated base.
Replace some of the lines with flexible SS hoses where there are short runs - especially those exiting the pump.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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