The fuel pump on a 1990 Toyota pickup is located inside the fuel tank. To access the fuel pump, you will need to remove the fuel tank from the vehicle.
Steps to Remove the Fuel Tank and Access the Fuel Pump:
1. Disconnect the negative terminal of the battery.
2. Locate the fuel tank straps and disconnect them.
3. Lower the fuel tank until you can access the fuel pump.
4. Disconnect the fuel lines and electrical connectors from the fuel pump.
5. Remove the fuel pump assembly from the fuel tank.
Note: Before removing the fuel pump, it is important to relieve the fuel pressure in the system. To do this, start the engine and let it run until it stalls. Then, turn the ignition key to the "OFF" position and wait a few minutes before removing the fuel pump.