A problem that *appears* to be a fuel pump relay issue might actually be:
* The EFI Main Relay: This relay is crucial for the entire EFI system, and if it fails, the fuel pump won't work. This is the most likely culprit if you're having fuel pump problems.
* The Ignition Switch: A faulty ignition switch could prevent power from reaching the EFI system, thus disabling the fuel pump.
* Wiring Issues: Corrosion, broken wires, or poor connections in the wiring harness leading to the fuel pump can mimic a relay problem.
* The Fuel Pump itself: The pump could be faulty.
To troubleshoot:
1. Check the EFI Main Relay: Locate the EFI main relay (your owner's manual or a wiring diagram will show its location). Visually inspect it for damage. You can also try swapping it with a known good relay (of the same type) to see if that solves the problem. *Be careful when working with relays and electrical components, always disconnect the negative battery terminal first.*
2. Check fuses: Make sure all fuses related to the fuel system and EFI are good.
3. Test the fuel pump directly: Use a test light or multimeter to check for power at the fuel pump connector. If power is present but the pump doesn't run, the pump is likely faulty. If there's no power, the problem is likely before the pump itself (wiring, relay, or ignition switch).
4. Consult a wiring diagram: A wiring diagram for your specific 1988 Toyota Pickup 22R is essential for accurate diagnosis. You can often find these online through forums dedicated to Toyota trucks or in a repair manual. This diagram will help you trace the power path to the fuel pump.
Trying to find a "fuel pump relay" specifically will likely lead to frustration. Focus on the EFI system and its components, and using a wiring diagram to troubleshoot will be much more effective.
