You'll need to consult a repair manual specific to your 1990 Dodge Spirit's engine (2.2L, 2.5L, or 3.0L) to pinpoint the exact location. A Haynes or Chilton manual will show diagrams and give detailed instructions.
Warning: Working with fuel lines requires caution. Gasoline is highly flammable. Always disconnect the battery negative terminal before starting any fuel system work. Allow the fuel system to depressurize before disconnecting any fuel lines. Wear safety glasses. If you're not comfortable working on your car yourself, take it to a qualified mechanic.