Thanks Ty.
BTW, I am in the process of install a valve with lock so someone cannot easily turn it off. I will also lock my generator so they cannot access the control panel either. I posted about someone turn of my generator on my 'neighborhood web' mailing list. Some one PM me about gas smell near my house after the hurricane. This email "speculate" that the person that turn off the gas was worry about a gas leak. The email did not admitted that he was the one that turn it off which I guess I would not either given the damage and lost of life resulting from this action.
As it turn out, one of my neighbor empty house, and elderly couple who recently moved to the senior assisted living, had tree fall damage that cause a small leak on their gas line.
We can planed all we want, but things sometime can really throw a curve at us. I don't think anybody can plan for this contingency, trying to do things to protect their tank/house. Hind sight, maybe I should. It really does not cost much in compare to the cost of the tank, or the cost I went through to disaster proof my tank. I plan to put a tag at the valve, clearly state that this generator is for life support, and not to turn off. Also I will put my phone number on this tag so that concern citizen will need to contact me if any problem. This will not stop the maliciously motivated saboteur but hopefully I live my life in such a way that I don't have to worry about this.