Doesn't the Gen 3 still have a threaded gas cap? The G4 has a cap that latches instead of threading in - usually if the gas cap light on a G4 is coming on, the cap needs to be replaced.
If it's significantly cheaper than the dealer, I wouldn't worry too much about trying the newest junkyard cap you can find.
Jim S. - Pittsburgh, PA
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2011 Ford Fusion SEL - Duratec25/6F35, 31k and counting
2001 Ford Taurus SES - Vulcan/AX4S, 190k and counting
1988 Pontiac Fiero GT - 2.8 V6/Getrag 282
Past: 1993 Taurus GL | 2002 Escort ZX2
Also in the Family: 2010 Fusion Sport | 2001 Toyota Camry LE V6