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fuel tank gas cap
In my 69 pickup, I recently got a gas cap for a 69 3/4 ton from LMC. When I take the cap off, you could hear air being sucked in or out. I figured they gave me the wrong gas cap.
So I got another one from another company while at the goodguys show. It has a blue vent thing in the middle (inside) of the cap. When I took it off, same thing.
What's up with this?
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