Why does my Saab 97X just shut down when I'm driving it, I lose all power.

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i have a saab 9-7x 2009, have had recent similar issues as above. have had fuel pump replaced which temporarily solved issue, then fuel pump relay modules fail. on replacement of module, car ran for a few days, then shut down again, only to work again upon replacement of module. Issue still not fully solved but may be worth checking the fuel pump system. Hopefully the dealer can hook up the car to their computer diagnostic system and see which failure codes are present.