* Under the hood in the underhood fuse/relay center: This is the most common location. The fuse/relay center is usually located near the battery, often on the passenger side fender well. The relay itself will be a standard automotive relay, and you'll need to consult your owner's manual or a wiring diagram to identify it specifically. The manual will often show a diagram of the fuse/relay box with the locations of each component labeled.
* Inside the cab, under the dash: Less common, but possible on some models. If not under the hood, check the fuse/relay boxes located under the dash, usually near the steering column or on the driver's side.
To find it definitively:
1. Consult your owner's manual: This is the best resource. It will show a diagram of the fuse box(es) and list the fuel pump relay.
2. Use a wiring diagram: A wiring diagram specific to your 1994 Chevy Silverado will show the location and circuit of the fuel pump relay. You can find these online through automotive repair resources or possibly a local auto parts store.
3. Check online forums: Search online forums specific to 1994 Chevy Silverados. Other owners may have posted pictures or descriptions of their fuel pump relay location.
Important Note: Before working with any automotive electrical components, always disconnect the negative terminal of your battery to prevent accidental shorts or shocks.