Reddit reviews 4 Rubber Vibration Isolator Mounts Male/Female 6-32 (7/16 Dia x Ht) 1/4 L Stud
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It would probably help to have it isolation mounted and in an enclosure. If you do build an enclosure you can further reduce the sound by lining it with something like Dynamat. Also look for threads on RV water pump silencing. Those may help.
These are the type of isolation mounts I am referring to; https://www.amazon.com/Rubber-Vibration-Isolator-Mounts-Female/dp/B0734N6NC2/ref=sr_1_4?ie=UTF8&qid=1500848148&sr=8-4&keywords=water+pump+isolation+mount Similar devices come with some high end after market fuel pumps.