I had something similar happen to me while driving Toyota Sienna minivan out of state on vacation after stopping to purchase gas. I checked everything under the hood and was deeply concerned bec if it happened where I live, I trust my Toyotas (also had Toyota Highlander and previously Toyota Camry that had 211,000 miles when we gave it away, plus 2 Toyota Corollas both which had 150,000 miles) to my mechanic of 20 years who long ago worked at dealership and it would have been my 1st Stop.
I continued to watch my gauges and surprisingly the light disappeared when I purchased gas the next time many 100's of miles down the interstate...whereby the problem had to do sonething with not putting back the fuel cap correctly/tightly. Guess what, I have occasionally visit Yahoo Answers and have seen someone else have the same/similar problem.
Hope the Above Info Helps...
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