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Most manuals probably say that just for a safety thing. By doing that instead of disconnecting the battery you dont lose power to the radio, clock, computer so they keep their memory.
The main reason for doing it in the real world is once it removed, start the engine and let it run till it dies, that will remove the pressure from the system. You will still get fuel comming out but it wont be under pressure. I recommend picking up a couple fuel line blocks (they clamp down on the rubber line on each side of the filter) that will keep any excess fuel from comming out on you.
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