If you guys call the manufactures I am sure they will tell you if equipment is putting voltage into the tank to git rid of it. ( I would) Who knows they may enven replace it. The fella who is talking about birds on Power lines- I think you are getting confused with step voltage. It won't apply in this case as the birds are at the same potential and not grounded. I have seen birds on high voltage lines 138KV and it dosen't bother them a bit. PS animals do not explode when the get in power lines equipment, they do get fried though.
No kidding they dont explode... it was an intentional overstatement.. they would most likely just be incinerated and burned up.
Lineman that service high voltage lines "bond" themselves to the line and charge themselves to avoid shock. Typically they do it from a helicopter, which is the same thing as a bird flying up. They also use a hot suit, to keep the electical charge flowing around their body, instead of through it.
Now if you were to give that charge a place to TRAVEL (ground, or other line), you would be killed. Providing a path to ground will dramatically increase current flow, melt metal, and fry anything in that ground path.
The reason birds arent hurt, is because its a "parallel" flow of electricity, and they have the same potental as the line. There is little flow of electricity... If you have 2 points of contact (another line or ground) the bird would be done for. The resistance in a birds feet, from one contact point to another, has more resistance than the line itself so its not an acceptable path.
On average, the bird will draw about one part per trillion (10^12) of the current flowing through the power line, which is something of the order of nanoamps
which is less than a static shock...
Recap... isolated is good, a path or travel is bad. Why use a grounding probe and give it a place to go?