There is only one fuel filter on a 2003 Cadillac, If I remember correctly the fuel filter on my 03' was on the frame rail drivers side rear and it was pretty simple to replace. You do need a fuel filter fuel line quick release tool, common to by at any parts store with the fuel filter that should be replaced every 15,000 to 25,000 miles or once a year.
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There is only one fuel filter on a 2003 Cadillac, If I remember correctly the fuel filter on my 03' was on the frame rail drivers side rear and it was pretty simple to replace. You do need a fuel filter fuel line quick release tool, common to by at any parts store with the fuel filter that should be replaced every 15,000 to 25,000 miles or once a year.