Well I have a stainless gas tank (Spectra) that I want to add a small sump onto, for the fuel pickup.

I need to buy some stainless sheet to make a little box to weld onto a corner of the tank.

As far as welding stainless, do I need to worry about matching the alloy, because I don't know
what alloy the tank is. I also want to weld in two stainless outlet bungs.

I won't be doing any welding BTW, I will need to find a guy.

Right now I'm just worried about alloy compatibility.