YUPP they can leak because of Mag rot or Gasket deteriorated or I have had a crack in the carb side half at the lower handle mount from a saw being thrown when saw owner was falling off of a debarker deck. Leak never showed up for 3 or 4 years after I got the saw. Other leaks were easily visible due to other saws bark dawgs or Leaking patches. One tank had a crack around a screw boss under the Kill switch. It was a bugger cuz it would only leak on a full tank or with a more than half full and cutting horizontal for while and the leak went into the air/carb box so wasn't immediately obvious. Take the tank off, empty it and pressurize it while you have it submerged in water. (With fuel line plugged the vent is in the cap so a piece of saran wrap might work if the gas doesn't melt it).
