Fuel Pump problems of the 2007 Mini Cooper S

Cold start issues and eventual "check engine" triggered by deffective high pressure fuel pump. Dealer replaced under warranty. Additional problem with excessive heat from engine causing warping of plastic hood scoop (3rd replacement).

The vehicle is constantly sputtering and loosing power. It hesitates on taking off and the performance is down significantly from when it was originally purchased. I have brought the car to the dealers several times and the stated that this was due to the fact that I was using poor quality gas. Since then I have changed to premium gas and the problems still persist. I finally brought the car to a renowned Mini mechanic and he explained to me that this is a recurring problem with the fuel pump.

I have experienced multiple failures of the fuel pump on my 2007 Mini cooper 7. It is now experiencing the early symptoms for a third time. The dealership failed to fix the problem on 4 occasions prior to the fuel pump seizing. They returned the "repaired" vehicle, and the replacement fuel pump was leaking (was overcome by the fumes trying to drive it home from work the same day it was returned). They repaired it a second time, and I had it checked by a second dealer. What are my rights in this situation? I am concerned there is a serious defect with my vehicle, and that the fuel pump could seize again suddenly (as it did last time). I have now met at least 3 other owners of the same make and model car who have experienced the same problems (and with the same dealership, westchester Mini/BMW).