When the weather is cold, I hear a pop from the gas cap after my Volvo S40 warms up.?

Question:
This only occurs when the weather is cold and the pop sounds when the car warms up. Does it have to do with the fuel or filter? It almost seems like a presure build up.

Answers:

How can the turn signal sound be turned off in a 2006 Ford Focus?

It is most likely because the fuel is cold, and as it, and the car, warm up it expands. Doesn't sound like a problem. It's a good idea to keep the tank as full as possible in the cold weather.

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