gas cap

So, I took the car to the track for the first time a couple of weekends ago. I quickly learned that, in hard left-handers, the gas cap wasn't up to snuff for holding back the gas slosh. It even managed to do it on a mostly empty tank. I checked afterwards, and my filler neck grommets seem to be...

(2001 GT AUTOMATIC) So a while back, when driving i noticed my "check gas cap" light came on the dash on the opposite side of where the check engine light is. Well i kinda figured it didnt mean anything as far as a damper to performance. I ignored it but later i decided to buy a new gas cap to...