Where can you find the fuel pump relay on a 1988 gmc safari van if there is one?

The 1988 GMC Safari, like many vehicles from that era, may not have a dedicated fuel pump relay in the traditional sense. The fuel pump control is often integrated into the computer system (ECM - Engine Control Module) or handled through a circuit within the underhood fuse/relay box. There isn't a single, easily identifiable "fuel pump relay" like in some later models.

Your best approach is to:

1. Consult the wiring diagram: A factory service manual for your specific 1988 GMC Safari is your best resource. These diagrams will show the fuel pump circuit and identify any components acting as a relay or switch in that circuit. You can often find these online through sites selling repair manuals.

2. Check the underhood fuse and relay box: Carefully examine the fuses and relays in this box. Look for a fuse rated for a high amperage (likely 20-30 amps or more) that's related to the fuel system or engine. While it's unlikely to be a dedicated relay, a blown fuse in this circuit will stop the fuel pump. Also, look for relays labeled with terms that might relate to the fuel injection or engine system.

3. Trace the wires: If you have some electrical troubleshooting experience, you can trace the wires from the fuel pump back toward the engine control module (ECM) and other potential switching points. This is more advanced and requires caution to avoid electrical shocks.

In short: Don't expect a clearly labeled "fuel pump relay." The control is likely more integrated into the electrical system of the vehicle. A wiring diagram is absolutely essential for proper diagnosis.