To find it definitively:
1. Consult your owner's manual: This is the best resource. It should have a diagram showing the location.
2. Use a repair manual: A Haynes or Chilton manual for your specific year and engine will have detailed diagrams and instructions.
3. Online resources: Search for "1997 Dodge Ram Van fuel filter location [your engine size]" on YouTube or a car repair forum. Pictures and videos can be very helpful.
Because it's often tucked away, be prepared to get down on your hands and knees and possibly use a flashlight. Remember that fuel is flammable, so be cautious when working near the fuel system. If you're unsure about anything, it's always best to have a qualified mechanic perform the replacement.