[jetskier]

I only got the noise when I use the tank with the stepdown regulator. It's the side opposite where the main gas line runs down the frame. My only guess is it's getting feedback from the main regulator and the diaphragm in the stepdown regulator is fluttering at a high frequency to constantly regulate the pressure downstream. I only noticed it on the last trip. I may try to fill both tanks and start with the tank with the stepdown regulator and see if the noise persists. When it made the noise, the tank on the side with the changeover valve regulator was completely empty.