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Posted by D Sherman [72.47.153.24] on Sunday, April 29, 2012 at 19:32:09 :
In Reply to: Gas tank repair... posted by Rick Pacholski [174.98.34.151] on Sunday, April 29, 2012 at 16:39:38 :
I would sure rather solder it, myself. I don't trust any kind of sticky-pucky in contact with gasoline. Even stuff that seems to hold initially has a way of coming loose or getting soft eventually. If you solder it, you know it will last. Of course there's danger in using a blow torch around a gas tank. I've soldered up gas cans, after getting them EXTREMELY clean, but have not tried a full size tank yet. The safer way would be to use an old-fashioned soldering iron, the kind that consists of a heavy pointy piece of copper on a long handle that you heat up in a blow torch located some distance away.
The key to soldering galvanized steel or bare steel is to get it good and clean with steel wool or sandpaper, and then use zinc chloride flux. Ordinary plumber's flux is okay for copper or brass, but it's marginal for steel and galvanized. Ammonium chloride flux (sal ammoniac) works okay too. Rosin flux is useless. Might be better to get a tin shop or radiator shop to fix it for you.
As for the liner, sounds like trouble down the road to me if it's flaking off. Maybe it was the kind J.C. Whitney used to sell that isn't good with alcoholic gas?
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