every time I take it off I get this soud that is like a woosh of air and today a cloud of what ooked like gas fumes cam out after a hard drive.
is this normal?

No,it'* definitely not normal. Your fuel tank should be at atmosphere when removing the gas cap. Something may be flukey with the EVAP system. I assume the SES light is not illuminated? codes?

no SES lights/ codes
but a few months ago I found the evap can to have a broken vaccume line I fixed
any ideas?

is the woosh of air you air filter sucking in air? ill have to hear this sound next time we hang. i havent noticed it yet.

no it happens when the motor is off if I go to fill up and open the lid

ooo i mis read what u said. are you just low on gas?

Perfectly Normal! The system is sealed and the Whoosh you hear (and so do I) is when we unscrew the cap and the atmospheric pressure equalizes.

There shouldn't be any equalization of pressure, there is no differential pressure to start with. Something doesn't appear to be right.

I suggest you trace the vacuum line from the evap canister to the fuel tank for more breaks or a disconnection. On cars our age, these lines very commonly crack or split from age.

Normally though, as suggested by markwb, a break in a vac line would result in a code light.

As Mark said, the tank should not be pressurized. only the fuel line is pressurized.

I would look to the venting system and wonder. Do you overfill your tank? Fuel in the evap lines and canister might lead to this type of condition.