Months ago I noticed when I took off the fuel cap on my Mustang that a lot of air came rushing out of the fuel keck as I spun off the cap. I thought it was a fluke at first but it's not. It's everytime. It doesn't seem to affect the way it drives but I can't think what would cause this problem given that the system is an engine driven mechanical fuel pump. The car is generally stock and I have probably put 1800 miles on it so I'm still learning it.
Tonight I took it on a 10 min drive with 3/4 tank and just as a test when I got home opened the fuel cap.... WHOOSH.
Any ideas on what to look at? Is this a problem or a feature?
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