most OEM replacement gas tanks are made of metal, but i think the tanks made for newer cars are now being made out of ABS plastic.
why do you have a problem with a plastic gas tank?
if anything, they're safer than steel since they don't conduct static electicity and won't spark if the metal is impacted.
The plastic they're using now is 1/4" thick tough plastic, you really don't have anything to worry about.
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