what could be causing my engine to shutdown, wen ever i start the car. It 95 A6 FWD, i start it, it runs for couple seconds and than stops, i m thinking the fuel pump is messed up thats was it sounds like, but dont know wat it is for sure, please help

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1995 Audi A6 2.8 FWD
1998 Audi A6 2.8 Q
2000 Audi A6 2.7 6 Speed
2000 Audi A6 2.7 Automatic