If you don't have the owner's manual, you can try:
* Looking in the under-hood fuse box: This box is typically near the battery, often on the driver's side fender well. The relays are often small square or rectangular components, usually in a socket. There may be a cover on the box with a diagram showing what each relay does.
* Searching online: A search for "1994 Dodge Shadow fuel pump relay location diagram" might yield a helpful image or forum post showing the location in a similar model year. Be sure to specify your engine size (e.g., 2.2L, 2.5L) as this can affect the location.
* Consulting a repair manual: A Haynes or Chilton repair manual for your specific year and model will definitively show you the location and other pertinent information.
Remember that working with automotive electrical systems can be dangerous. If you are not comfortable working on your car's electrical system yourself, it's best to take it to a qualified mechanic.