There is a smell of gasoline inside my 1981 ford
vehicle. Obviously it has a carburetor. When I drive
the vehicle one can smell the gas also my passengers
at times state there is a smell of gasoline inside the
vehicle. Sometimes it is worse then others. At times
even if I have a window open you can still smell the gas.

At times while driving I stop the vehicle open the hood
and try to determine where the smell is coming from.
there seems to be no smell of gasoline under the hood,
no sign of dripping gasoline anywhere around the carb.

I thought perhaps the gas cap seal, not so no smell there.
Checked for dripping gas under the vehicle, nothing there.

Any tips where to check?

Any assistance to solve this problem much appreciated.

Thanks in advance
Denny B