I got a new gas tank with a new sending unit. The ground for the sending unit is not attached anymore. I can see where it was once attached but fell off. I tried sodering it back there and cant get it to stick. If i ruff the metal up with a file or emory cloth will it stick or how do i get it attached?
Im guessing its galvanized since the soder isnt sticking.
Im guessing its galvanized since the soder isnt sticking.

