LOZMan,Do you cover your boat? If not, start. I learned my lesson last spring; fortunately my alarm went off on my FTD and probably scared the $hit out of the would-be thief who pried open my port rod locker.The BCB alarm system is good insurance and protection–if you have it on your boat, USE IT. It wont stop the gas thieves, but will protect your gear.It would take some time and effort to siphon 52 gallons. Are you in 4 Seasons Marina, or just the same cove? Where did you gas up at; the marina gas dock, perhaps? Gary Hollander