Check your gas filler neck for cracks, there is a re-call for this, have the dealer check it out. Also, depending on where you live, like in
snow country, the top of the fuel tank itself could be rotting out. There are many things this could be, like leaky fuel injectors, fuel regulator, fuel pump, but start with the filler neck first, which was a common problem for the earlier TB's. As far as...