Gas Tank Question

I bought a 1997 Sunfire with 2.2L engine two weeks ago. My question is, everytime I remove the gas tank cap to fill gas, I never heard or feel any air that comes out from the gas tank. My car runs fine but all the cars that I had, I always had air pressure coming out from the gas tank.

I bought a 1997 Sunfire with 2.2L engine two weeks ago. My question is, everytime I remove the gas tank cap to fill gas, I never heard or feel any air that comes out from the gas tank. My car runs fine but all the cars that I had, I always had air pressure coming out from the gas tank.
well some have air that comes out or some dont. mine doesnt. some may have vents to vent fumes so u cant catch on fire or something when removing gas cap to fill up.