What is the vehicle's current mileage? Is it driven mainly for relatively short trips i.e. around the corner and back, long commutes, or a combination of both? Since the car has only died twice at 1/4 and 1/8 of a tank, how much gasoline is normally kept in the tank? Discovered quite awhile ago, the fuel gauge on the G8 isn't 100% accurate which could be a calculated buffer. However, that's neither here nor there and it appears as if something is either on its way out, overheating, or shuts off after getting hot. The fuel pump is designed to pump fuel to the rail as long as it has fuel, power, and ground. Therefore, it getting down to 1/4 and 1/8 of a tank and possibly being unable to acquire gasoline is interesting. When the vehicle quit, was it a slow death as in sputtering or all of a sudden?