Started smelling gas vapors in garage after driving vehicle. No obvious leak under hood or under vehicle. Stronger smell noted near rear of vehicle. Could not figure it out for several months. This post helped me identify where to look for the problem. Used cheap endoscope camera (<$20 on Internet) to inspect top of fuel tank and fuel pump housing without needing to drop the tank. Verified that after running car the top of the fuel pump housing appeared "shiny" as if it were slightly wet. Found several areas around the fuel pump outlet boss and exit tube nipple that appeared to be hairline cracks due to their contrast to other areas of the plastic on the top of the fuel pump assembly.
Bought replacement pump on Internet for $59 delivered to my door. Consulted several well done videos on You Tube to understand how to drop the tank and replace the pump including where to find and how to disconnect all of the hoses and couplings. Only tools needed were floor jack, few wood blocks, lug nut wrench to remove drivers side rear wheel, jack stands on rear axel, 15 mm & 13mm sockets for tank hanger straps, small screwdriver, needle nose pliers (to release some of the quick disconnects on the lines). Things came apart remarkably easy for a 14 year old vehicle with 200k miles. Job completed from start to finish in about 4 hours. No more fuel smell. This was a very dangerous problem from a safety aspect not knowing the source of the fuel which was only about 6" from the exhaust system under vehicle. Thank you all for sharing information on this. For all you home mechanics out there I would recommend picking up one of these cheap flexible endoscope camera systems from a site like T-mart on the Internet, only $20 and run on your Smart phone as the display, can take pictures and videos through phone in hard to reach spots, wonderful for inspecting where you can't see directly. Have used it to identify/verify many issues before needing to dis-assemble stuff.