The box contains charcoal that acts as a catalyist for the gas fumes that are drawn into the box from the gas tank. The tube with the service port, carries the fumes to the purge valve, where (after a certain time) they are released into the intake. This enhances the combustion process.
The tray is for an extra battery. This is sometimes needed in cold weather climates -- especially if the engine is a diesel. Otherwise, if there is not an extra battery, its just an empty space.I put a spare quart of oil there for when I need to add some.
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Saturday, October 3rd, 2009 AT 2:12 AM