* Under the hood in the fuse box: This is the most common location. The fuse box itself might be located near the battery or on the driver's side fender. Look for a diagram on the inside of the fuse box lid to identify the fuel pump relay.
* Under the dashboard: Less common, but possible. This would require checking various fuse panels under the dash.
To find it definitively:
1. Consult your owner's manual: This is the best source for the exact location of your vehicle's relays.
2. Use a wiring diagram: A wiring diagram specific to your 1994 Chevy Astro van's engine (4.3L V6 or 2.5L I4) will show the location and circuit of the fuel pump relay. You can find these online through repair manuals (like Haynes or Chilton) or automotive parts websites.
Remember to turn off the ignition before working with electrical components. If you're not comfortable working on your car's electrical system, it's best to take it to a qualified mechanic.
