My alarm went off yesterday after switching tanks, stayed on until i got it back to the marina. I can see no obvious problem, still runs great. It's actually went off a few times before. First time was after my regulator burned up. Then it went off a couple of weeks ago idleing but didn't stay on so, i checked the water stream, then made sure i had oil. The 2 cycle was around a 1/4 tank, so i topped it off to be on the safe side. It came on again yesterday after i switched tanks. This time it stayed on. I would just like to know if there is a check list to go down when it sounds. So far i'm thinking it sounds when the 2 cycle is low or VRO is not recieving oil or there is a problem with the motor cooling. All this is just speculation though. I'm curious if it is covered in the owners manual or possibly a Johnson/Evinrude shop manual? Could someone shed some light on this buzzer?