The fuel filter on a 2001 Dodge Ram Van 3500 is located
on the frame rail, near the fuel tank. It's usually towards the rear of the vehicle, but the exact location can vary slightly depending on the engine and specific configuration. You'll likely find it in a relatively protected area, perhaps with some heat shielding.
To be certain, you should consult your owner's manual or a repair manual specific to your 2001 Dodge Ram Van 3500. A diagram will show you the precise location. Searching online for "2001 Dodge Ram Van 3500 fuel filter location" with images may also help you visually identify it.
