* Under the hood in the fuse box: This is the *most common* location. The fuse box is typically located near the battery. Look carefully inside the fuse box for a relay that's labeled "Fuel Pump" or a similar designation. You might need to consult your owner's manual's fuse box diagram to pinpoint the correct relay.
* Under the dashboard: Less common, but possible. Some Caprices might have it in a secondary fuse box located under the dash, often near the steering column. Again, your owner's manual is crucial here.
To find it definitively:
1. Consult your owner's manual: This is the single best source of information for your specific vehicle. The diagrams within should clearly show the relay location.
2. Use a wiring diagram: A wiring diagram for your 1990 Caprice Classic (available online from various automotive parts sites or repair manuals) will show the fuel pump relay's location and circuit.
3. Search online forums: Forums dedicated to Chevrolet Caprices, like those on sites like car forums, often have discussions about component locations. Searching for "1990 Caprice Classic fuel pump relay location" may yield helpful results and pictures from other owners.
Remember to always disconnect the negative battery terminal before working with electrical components to prevent shorts or injury.
