What are common causes of fuel leaks on a 95 Oldsmobile 88?

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Info on the car: 1995 Oldsmobile 88, V6, 130k So, we've replaced or repaired just about everything on the car since we got it from my grandma back in 2008. The car runs really well now but on Friday it started to smell of fuel in the cab while driving home. When I got home I came back out to see if the smell had dissipated a few hours later but no, it still reeks of fuel inside. We had the fuel feed pipe replaced back in 2011 but at that time you were able to see fuel leaking out and now I see nothing. It's sat untouched since Friday and its now Tuesday and still smells awful. Going to call the repair shop but was hoping to be able to provide info on what's wrong besides "it smells bad". Any ideas on where I could look for a leak or signs of the problem before I make the call. Any help would be much appreciated. Thanks.