You got it. What the vacuum valve does is open at 50 degrees or 60 depending on what one it is. This supplies vacuum to the fender well check valve. Then that opens and allows the gas fumes to pass back into the intake to be burnt.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....