Should have posted but I had the same thing happen. When I bought my Cobra from Unique in 2005 it came with a brown, plastic connector that must have shrunk over time and pulled away from the filler cap. Was filling up when a someone next to me said "Hey - you are splashing on the ground" - pushed the Cobra away from spot and let dry. Had Weavers ship me the better rubber one.

Everyone should check but replace regardless......was scary - my friend that was driving with me for the first time was not impressed with my build quality,

Dave