My Cadillac CTS has trouble starting after I fill it up with gas. This is a new problem. Does anyone have an idea what is causing it. I was thinking of changing the fuel filter. My CTS has 63,000 miles. Jerry

 

Changing filter is a good place to start, shake fuel out of inlet of filter after remove - see what comes out.( water / debris) You may have got a tank of bad fuel. Contact local news media to see if they have heard of any reports of contaminated fuel in your area. Have car checked for codes and post.