To be certain, you should:
* Consult your owner's manual: This is the best resource for the specific location on your van.
* Look under the van: Carefully inspect the frame rails near the fuel tank. The fuel filter is usually a cylindrical canister, often with fuel lines connected to it.
* Search online for a diagram: Search "[1993 Ford E-150 fuel filter location] [your engine size]" on Google Images or a similar search engine. This will show you images from other owners.
Caution: Always be careful when working near fuel lines. Avoid sparks and open flames. If you're unsure about locating or replacing the filter yourself, take your van to a qualified mechanic.