Propane tanks are designed not to leak on their own. Though it is possible for a connection or a hose to develop a minor leak. If you smell the “Rotten Eggs” odor of a propane gas leak, and you feel it is safe to do so, you should turn off the cylinder valve by turning it to the right. If you cannot safely turn off the valve on the tank, you should immediately leave the area and dial 911 or call your local fire department. Then make sure to have a qualified service technician inspect your grill and propane tank before attempting to use it again.