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Old 06-29-2008, 10:43 AM
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With gas at $4/gallon it helps to keep as much of it for burning in the engine as possible. Basically takes vapors from carb bowl and reroutes them back to tank to be used again in liquid form. Thus the name "EVAPORATIVE". On older systems they would have been allowed to be exhausted or evaporated to the atmosphere, same with tank, so also coincides with proper cap on fillerneck as well.
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