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Thanks Floridianson. I'll dig in again and see if I can locate the test procedure.

Thanks rustystud. So it sounds like I was on the right track with it being the check valve between the tanks. Nice to know that I'm not starting the season out chasing a ghost.

I'm wondering if it could be the check valve between the tanks? Maybe as one tank bleeds down slightly the check valve lets out a small puff of air towards the tank with the lower pressure. After sticking my head right up by the ends of the tanks it sure sounds like that's where the sound is...

It's an odd one for sure. It's not an external release of air. Definitely inside of a metal line. I've placed my hand on every fitting and no air is being released at any of the tank fittings. It seems that the metal lines and the tank body are amplifying the sound. It's so slight that the gauge...

Fired the truck up from its winter slumber this morning. Popped right of and everything seems good to go. Shut her down and walked back into the office. That's when I heard it. It sounded like a timed release of air in a hard line. I walked back out in the shop thinking something was going on...