I have a new to us 425f from 1994. I've cleaned up all the dirt and grime and, based on the advice here, I'm emptying the fuel tank and will put fresh in. When I emptied it, the fuel that came out of it was pink. Any idea what that would be? I know that Coleman sometimes has a bluish tint, but I've never seen pink fuel before. Did the previous owner run gasoline through it? Is that pink? Thanks!