[Shizznizz]

I also don't understand the fuss.. Plastic tanks are in every major OEM car at the moment. I'm running EFI on my Backdraft, and its on a plastic fuel tank.

The idea that stainless or aluminium is better, is just a matter of our historic and intuitive preference to 'stronger' materials. However there are also significant drawbacks to stainless and aluminium. Both materials are much more likely to crack on the heat-affected-zone (HAZ) after welding, where the material is left brittle from the welding process.

So: in a collision, i'd prefer my plastic tank over either SS or Ali any time.
EFI does work just fine from the plastic tank too.
It might not look very hot-rod and 'cool' to most.. but that's a different topic for a different day.