Fuel cell
From Halopedia, the Halo wiki
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The Fuel Cell is a glowing blue and grey barrel located behind the left wing on the Ghost that is a Ghost's primary weakness. One well placed shot can take out the Ghost when it is hit in the fuel cell, making it of the upmost importance to aim for. It was only lethal to the driver of a Ghost in Halo 2, as in Halo 3 it does not function the same way it did in Halo 2.
It provides the engines and the twin plasma cannons of the Ghost with its stored plasma supply.
An explosion big enough to destroy the Ghost can be triggered if it is hit with a single bullet from such weapons that are able to cause a Headshot.
