i have this tank someone sent to me and never told me its rusting out inside near where fuel pump goes the guy i got it from must have left old gas or water sitting in it for awile. im going to clean it out best i can but anyone know what i should clean with and if i even should use this tank on my bike probably not a good idea to use

 

you really cant fix rust unless you grind it and re-seal the inside of the tank