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I believe it's called a Charcoal Canister, it is meant for your EVAP system. The vapor from the gas tank are routed towards the canister to be absorbed into the canister. Usually the vapors are drawn into the engine by vacuum into the intake manifold to be burned.
Might be something some one added on/ Trace the wire down. It looks like it has a button . Maybe someone added their one anti theft device.. I have one on the firebird,but its just a on and on switch. Turned off--you crank it all day and it won,t fire.Mounted under battery on inside off curbside fender. Thanks!