* Under the hood in the fuse box: This is the most common location. The fuse box is usually located near the battery. Check the fuse box diagram (usually on the inside of the fuse box lid) to locate the fuel pump relay.
* Under the dash: Less common, but possible. Check the area near the steering column for a fuse box or relay panel. Again, check the diagram.
* In the Under-Dash Fuse Block: This is another possible location for some years/models.
To find it definitively:
1. Consult your owner's manual: This is the best source of information. The manual will have a diagram showing the location of all fuses and relays.
2. Use a wiring diagram: A wiring diagram specific to your 1986 Chevy Astro van's year, engine, and trim will pinpoint the relay. You can find these online (often for a fee) through sites specializing in automotive repair information, like Chilton or Haynes.
3. Look for a relay that's labeled: Some relays might be labeled directly. Look for markings that suggest a fuel pump connection.
Important Note: Before working with any electrical components, disconnect the negative terminal of your battery to prevent accidental shorts and injury.
