To find it, you'll need to:
1. Consult your owner's manual: This is the best place to start. It will have a diagram showing the location of all fuses and relays.
2. Check the underhood fuse box: Open the hood and locate the fuse box (often near the battery). The cover usually has a diagram showing what each fuse and relay controls. Look for labels like "Fuel Pump," "EFI," or similar.
3. Check the interior fuse panel: If you can't find it under the hood, look for the fuse panel inside the cab, often under the dashboard. Again, check the diagram on the panel cover.
4. Use a wiring diagram: If you're still having trouble, you can find a wiring diagram specific to your year and model of Chevy van online (many are available through repair manual websites or forums). These diagrams will show the location and circuit for the fuel pump relay.
Important Note: Before working on any electrical components, disconnect the negative terminal of your battery to prevent accidental short circuits.