yup, the frame is acting like a giant tuning fork. you can dynamat the mounts, you can rubber grommet the mounting holes for the pump. Keep this in mind though, when it is buzzing, you know it's running. I was able to detect a defective pump because the noise was inconsistant before I even got back in the truck one morning while it was warming it up, a quick double check of the pressure guage confirmed what my ears were hearing, I then switched to a FASS pump only system and it is quieter, now I rely totally on the guage.