To find the correct fuse(s) or relay, you'll need to consult your 1990 Dodge Spirit's owner's manual. The manual will have a fuse/relay diagram showing which circuits are protected by which fuses and where they are located. The diagram will likely show a relay for the fuel pump; the relay itself might not have a fuse, but the circuit powering that relay will have one or more fuses protecting it.
Without the owner's manual, pinpointing the correct fuse(s) is very difficult and potentially dangerous. Incorrectly identifying and replacing a fuse could damage other components or create a fire hazard. It's best to obtain a manual (often available online as PDFs) or consult a qualified mechanic.