I have an 11 year old ZX11. It sat for about 2 years with a full tank of fuel. Recently, I took it off teh hands of the previous owner for a good price. The inside of the tank has some rust, and I can hear sediment in the bottom of the tank. I drained the old fuel via the bottom drain hose. I am wondering if the tank is salvageable and usable, with the powdery rust inside? I rinsed it out with some cheap fuel to flow the rust downward toward the drain hose. I also see some gas leaking out of the little fuel level sensor underneath the tank. Should I try an inline fuel filter at the petcock to be safe? Is there room to install a very small filter? The ones I see are pretty long at 1.5 inches long. Any ZX11 owners with advice?