It ain't quite the same, but I have one of those gas caps BAT sells that does sorta the same. I have not had a CEL due to it in the ~3 years I've had it.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15