Question: 2004 gmc Yukon. When taking off fuel cap a lot of pressure along with fumes come out.
Lots of pressure, air, and gas fumes come out when taking off fuel cap. Thought the fuel cap want sealing so replaced it. Didn't fix the problem. Also noticed the last couple of days fuel is being used twice as fast as normal. A ten mile trip now shows up on the range as using 40 miles worth of gas.
Ron W
Expert Mechanic
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