Soldering Bronco fuel neck?

relax you are not introducing enough lead into anything to harm the engine, keep in mind, they used lead as an additive to gasoline for years, long ago until the figured out it was staying in the air, and then contaminating everything from the mountians to the ocean. The fuel is going down that tube so fast not much is getting into anything. I would not worry about removing it later, leave it, fix up the tube as best you can I know some vehicles have a rubber hose that connects body to fuel filler tube, so just take your time, and be sure not to overheat the filler neck near any rubber , because heat actually transfers through metal and can melt rubber. Take your time, and do it right. And it never hurts to have a fire extingusher on standby when working around gasoline.