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An #6 One Way Check Valve Roll Over Air Vent Kit With #6 Weld On Bung For Fuel Tank - Pacific Customs
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Amazon.com: Okimyi Fuel Gas Can Vent Caps, 3 Pack Upgrade Fuel Gas Can Vent Kit, Fuel Gas Tank Vent Caps for Gas Can Fuel Tank Water Jug to to Allow Faster Flowing :
Does the vent in a truck fuel tank allow the air to get out? If it does, how does the fuel leak when the truck is going up/down a hill? - Quora
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