Mig weld or braze my gas tank sump? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-03-2010, 07:04 AM
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Mig weld or braze my gas tank sump?

Guys,

I'm getting ready to weld my sump pan onto my gas tank (it's a new tank so there aren't any fume issues) and I'm wondering whether I should MIG weld it or should I braze it? Which one is more likely not to leak?

Mike

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Old 09-03-2010, 09:17 AM
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Definitely braze it, that is much easier and will last forever just like a steel weld. Flush that tank out and fill it with water up to near the weld area, always fill it with water and don't trust just washing it out.



And whatever you do DON'T fill the tank with exhaust gas and expect it to be safe! That is not done often but some people will sometimes recommend doing it so anytime I see a question of welding on a gas/fuel tank I try to mention it. I know of one fatality and another serious injury from doing that.
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Old 09-03-2010, 10:26 AM
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Thanks, but like I said, the tank is brand new so I don't need to worry about fumes. Really, for me, it would be easier to MIG weld it, but if you think it really is better then I can braze it. Is a braze weld less likely to leak? What about the utility of coating or sealing the inside of the tank when I'm done? Is that possible/helpful/necessary?

Mike
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Old 09-03-2010, 12:15 PM
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I'd go with a nice controlled TIG weld of the sump to the tank. Mig welding is more like 'dynamite is to a firecracker'.
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Old 09-03-2010, 01:54 PM
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I don't have a TIG welder, though. I think I'm going to go with the MIG welder because it is easier for me than the braze, although I do have the O/A tanks.

Mike
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Old 09-03-2010, 02:48 PM
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I would Mig it.. that is all I use.. Clean really good, And weld it up..I would run a very small sealer pass, Then Put a cap pass over it.. If you do it right you won't have any leaks..
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Old 09-03-2010, 03:19 PM
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Hi Mike,
Your less likely to have a leak if you braze it.
Rich
PS If your unsure of your brazing abilities, just practice a little as brazing is quite easy.

Last edited by richard stewart 3rd; 09-03-2010 at 03:25 PM.
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Old 09-07-2010, 08:36 PM
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I have done both mig and tig for this.Mig does work but I had problems w slight seeping when testing with water at beginning and end of each weld section.I prefer to tig as it is easier to flow out any imperfections or flaws.
I have not done any brazing so I have no opinion other than I feel it much more akin to tig welding and results.
Also superglue will permanetly seal small imperfections on the welds.Or I have also used the gastank sealer from parts store and coated the welds with it.
just trying to give a hand with what I have learned on my projects.
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Old 09-07-2010, 09:13 PM
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With modern 2 part panel bond epoxies you can also do this with no welding at all if you should choose to. Also works great as a skim sealer for mig welds if you find you have a pinhole leak.
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