It's not visually obvious. You won't find a large, easily identifiable canister like some other vehicles. It's usually a smaller cylindrical filter in the fuel line. You'll need a repair manual or a detailed diagram specific to your 1993 Dodge Spirit's engine (2.2L, 2.5L, or 3.3L) to pinpoint its exact location within the fuel line. A Haynes or Chilton repair manual for your vehicle would be the best resource.