Rick's Free Auto Repair Advice

Posts Tagged: P0447

Evaporative Emissions System Primer

How does an evaporative emissions system work? The Evaporative Emissions System is responsible for preventing fuel vapors from polluting our air. If you came to this post because your vehicle won’t fill with gas, skip to the bottom of the post In the old days gas tank caps were vented to the atmosphere. That allowed outside air to enter the tank as you used up the gas inside the tank. On warm days the gas expanded and gas fumes vented backwards through the vented cap to the atmosphere. In other … Read More


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