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It is probably because of the expansion of the gas (fumes) in the fuel tank. Many vehicles and especially motorcycles (because the fuel tank is exposed to the sun) do this, sometimes it even makes a hissing sound as the gas escapes, sometimes it makes a whining/humming sound

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Q: When the weather is cold you hear a pop from the gas cap of your Volvo S40 after the car warms up?
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