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The gas cap is going to offer a lot of resistance before it vents that rout, what you are most likely seeing is the check valve that lets air in to the gas cap, the Evap system on the truck is going to provide a very easy way for the fuel tank to vent but while it's venting it's capturing the fuel too, unless you walk by your vehicle on a hot day and smell fuel vapor leaking out of the gas cap and if that was the case you would notice, it would stink like someone dumped some gasoline on the ground.
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