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Well there is an explanation for everything, not sure I am sharp enough to explain your experiment's results so far. But since you have a technical background, how do you observe corrosion inside an airtight alum container?



All 4 alum tanks I made with a real short filler neck
and gas caps(production stuff) and 2 have vents..
I just open the cap and look in with a flash light..
then change the fuel and put the cap back on.. pretty
simple... (to keep it air tight, fill it all the way up)



I would anodize the tank. It is cheap to get done & you have a few choices of what colors you can get done. All of the race/street fuel fittings we make at work for customers are anodized for this reason. Mainly the import guys that run E-85

You should have all of your fittings hard anodised , all of the aluminum lines done inside and outside as well as the cell inside and outside



I looked into having the inside of my handmade tanks done on the inside and found out it was not able to be done at a affordable price.

This place did that kind of work as they applied dow7 to my mag dragster body, but was not able to hard anodize the inside of my fuel tanks at any price.

Kinsler Fuel injection is who warned me of the problem many years ago when they did my injection.

These are tanks out of my early TADs, the later tanks have a internal vent that went out of the bottom, very trick.





And a 632 donovan big chief injected on methanol, 1993. This car had a plastic Jaz fuel cell in it, perfect for alky use IMO. Actually this car had 2 fuel cells in it, the second held racing gas for the nitrous injection.