I remember I came across their site because they were mentioned in the last MotorTrend SUV edition magazine.
http://www.amp-research.com/store/fueldoor.htm
Somebody shaved off a good chunk of that market already with a first to market product. I bought one and I think I overpayed for the quality I got. Scary that there internal prototype picture made it out to the Internet.
The only way they can catch up now is by producing a better product.