2005 Buick La Crosse fuel filter

I have a 2005 Buick Lacrosse that keeps cutting out on me. Recently it quit running completely and after 4 tries it restarted. It has been to a garage a few times and they told me to put dry gas in the car. I was wondering if this could be the fuel filter? I know they are an in tank filter and they are nonservicable. Does this mean that the fuel filter should never have to be changed? Any ideas, I am tired of the run around from the dealer. Thanks, Brian.