Porsche keeps moving around the parts catalog on their web site. The catalog has diagrams of the systems. Usually under the Service and Parts sections if you poke around. I left you a private message with the current site location. Enter the model number and model year on the page and download it if you can for future use.
The environment controls for the gas tank have changed since the intro of the 986 so the bootleg CDs may not be much help.
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