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Advice on building a new fuel tank

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crider:
I've been running an old Eelco tank on my dragster and it was working fine with the carb setup, but it isn't big enough for the hilborn setup on methanol, so I think I'm just going to build a tank to fit down inside the rails of the chassis.  What aluminum alloy is the easiest material to work with? Where can I buy it online? I'm also open to any other advice, I've done my share of welding and fab work but this will be my first try at building a fuel tank.

wideopen231:
 Cpl things from so so fabricator and they maybe giving too much credit.  .060 aluminum is easier to weld than .050 and weight near nothing. 3003 is easier to bend up but not as strong as 5052 .  Make sure you have adequate baffles, big enough vent or vents.  Neil and Parks sell weld in bung and cap if you need to locate one. Make sure zero leaks before adding fuel.I know you knew that,but its lot better than finding one and welding after draining fuel.  Don't be afraid of building little bigger than you think you need.If want 4 gallon and design works out to  just under 5 don't sweat it.Guess how I know this one? Besides it just frontal weight which you probably have to have anyway.

dreracecar:
5052 H32 Aluminum  X .063 
NO 90* edge welds, always roll the edges to create a butt welds
 Tall and short tank is better than a long and skinny
 Vent each end to a common middle vent
Lenght X width X hight devided by 231 will give you the volume
You can get the Alu PVC coated to help with not scratching as you are bending, but you really have to scrub where the plastic was glued on to make a clean weld
Where the bungs and filler goes should be flared to fit, to keed the heat warpage down
clean clean clean and did I mention clean

dreracecar:
proper venting and no sharp corners

crider:
Thanks Guys. Any good online place to buy material from? I live in the middle of nowhere and I can't find anything here to work with

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