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My brother has the same truck, the gas tank does not vent out the gas cap, the fuel vapor is stored in the charcoal canister, like every other vehicle sold in the USA in the last 25+ years, there is also a good chance that if your gas cap didn't seal and was venting fuel vapor that your check engine light would come on and tell you that there is a leak and that fuel vapors are not being collected and burned, it's pretty standard on OBDII vehicles.
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