On Jul 14, 12:44*pm, Ignoramus23641 ignoramus23...@NOSPAM.
23641.invalid wrote:
I am trying to solder a brass fitting to the fuel tank.


Easy as - get the right tool for the job, in this case a very large
plumbers soldering iron - the type that was at least 100 watts, with a
1 inch diameter bit in it that was the massive heat reservoir needed.
(There was even a pump up gas fired one for the real heavy duty
stuff.....) Gas axes are iffy, unless your pretty good at brazing - I
aint, but soldering works fine long term on the very few that I have
done.

Andrew VK3BFA.