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Old 05-27-2019, 12:23 AM   #5
franken
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Join Date: Jun 2013
Location: Somewhere
Posts: 3,052
Re: Another “what is this” post from me

Those are used to make fuel vapor get sucked into the engine and burned. The system uses a nonvented gas cap so one way or another, the tank is being vented if the system isn't working. It's pretty simple to make it work and has a purpose.
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