Fuel Tank

Typically what type of material is a racing fuel tank made out of? Also, What is the thickness?

I have to design a fuel tank for a hybrid electric equinox for one of my engineering classes. I thought that fuel tanks might be made out of stainless steel because it doesn't rust but I'm not sure. Thanks for the help.

Seems to me that it would be aluminum 6061T6. It's much lighter than steel and pretty strong. Thickness... I'd assume something around .100 - .200" because it has to sustain a lot of vibration, as well as support a liquid load. But I design space vehicles... not automobiles. That would be my first guess though.

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