Jay, the bloop tube in the fuel cap will not allow fuel to leak out: it is closed and sealed except when there is a vacuum inside the tank. When the tank pressure is below atmospheric pressure the bloop tube burps briefly to let air in. I think both chainsaw and line trimmer manufacturers try to have the fuel cap above fuel level as much of the time as possible, but I think both machines have submerged fuel caps much of the time when they are running, especially when the tank is full. If your brushcutter leaks fuel when it is upside down it sounds as if there is something wrong with it. I would prefer not to store the thing with the vent submerged, but that applies to chainsaws too. There is always a vent somewhere, and the pressure in the tank varies with the outside temperature: some of the time there will be a higher pressure inside the tank than outside it. If everything is working properly it won't leak even then, but it is better not to find out the hard way that there is a leak.
Last edited by grumpy; 01/10/09 04:56 AM.
