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Joe,
I had the same problem - twice. The first time it turned out to be a hole in the rubber hose connecting the fuel filler inlet pipe with the gas tank. The hose is large diameter (size of the filler neck) with a smaller branch (size of a heater hose) coming out the side and going into the tank. I think it's probably for relieving pressure during the filling. The smaller hose was under stress the way it was installed, and eventually caused it to split. You can see the hose by removing the felt lining in the trunk and opening the access hatch at the front of the trunk floor. I diagnosed the leak by bleeding pressurized air into the tank and hearing the hiss where it was leaking. The hose is a dealer item for about $40. Couldn't find an aftermarket substitute.
The second problem is what Mr. T. Tom is referring to. My fuel rail started leaking on the engine. There have been some posts in the past here about this problem. Something about the fail mounts bolted directly to the block and not having enough "give" to absorb engine vibration. It eventually cracks and leaks gasoline. Mine was an intermittent problem. Took it to the dealer and it behaved perfectly, so the dealer couldn't find the problem. Second trip he kept it overnight and was able to experience the fumes when he drove it after starting it cold. Then he could see the leak around the base fo the rail. They replaced the fuel rail and fixed the problem. A potentially dangerous situation - vaporized gasoline mixing with air in a turbulant environment. Don't smoke while driving in this condition, and keep the fire extinguisher nearby.
Just a couple of thoughts. When you find out, please post back here. If it's something else, I'm sure I'll be having to fix that problem eventually, too.
Robert
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