Another thing you might look at is the installation of the water pump. Mine went bad in my 2014 Vegas and when I went to replace it with a Surflo, the instructions said do not connect the water pump directly to plastic pipe. Make sure you have a 6" hose between the pump and plastic pipe to dampen vibration from the pump. Not only can it damage the pump, but the vibration of the pipe causes quite a bit of noise.
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