1990 Acura integra smells like gas when I start it coming frm exhaust?

I have 1990 Acura integra gs and when I start it I can smell alot of gas coming from the exhaust it seems to be running good but don't know y it smells of gas?|||There might be a leak in the gas tank and if you mean the exhaust smells rich in gas, it probably needs a tuneup or something.