Probably fuel rail or injector leak on older models, "this is why it's important if you smell gas need to look for leak or get it checked out before it turns into gusher". GM had some problems in 90s, fuel system would spray gas on hot exhaust, burn wiring in few seconds, then the automatic locks on the doors wouldn't work or the elect windows in some bad cases. Even carbureted engine had this problem if the float stuck and pumps gas out the vent fill top intake and reached the hot exhaust manifolds. This happened to me in early 80s truck. Smell gas and immediately pulled over, when I popped the hood the intake manifold was covered with gas. I got lucky it didn't catch fire. If I kept driving I'm sure it would have.
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