* Consult your owner's manual: This is the best resource. It will show a diagram of your specific van's fuel system.
* Look near the fuel tank: This is a common location for many vehicles, but it might be above or below the tank. You might need to crawl underneath the van.
* Follow the fuel lines: Start at the fuel tank and follow the fuel line(s). The filter is usually inline somewhere along the path to the engine.
* Use a repair manual: A Haynes or Chilton repair manual for your specific year and engine will have diagrams and detailed instructions.
Without knowing the engine size (e.g., 3.9L, 5.2L, 5.9L) it's impossible to give a more precise location. The engine size will significantly impact the fuel filter's placement. Searching online for "1992 Dodge Ram van [engine size] fuel filter location" will likely yield more targeted results with pictures.