I smell gas after I start my engine & when I shut the engine off

What is your question?

my 91 300E seems to run good. I am concerned about the smell of gas . I am due for smog before Mar 8 this year. I am thinking maybe a clogged fuel filter or maybe a new one? I am not to keen when it comes to anything under the hood. I am female and just turned sixty so I could sure use a little help. Thee only other problem I had with this car is the small black rubber square that holds the muffler in place was broken and had to be replaced . I do go for reg oil changes on scheduled dates. So .. any advise on the fuel smell problem