Toyota 23221-46060 Fuel Pump Assembly

To check the operation of the fuel pump, first turn on the ignition switch without starting the engine. Then, bridge the terminals +B and FP of the test connector using a jumper wire. Listen for fuel pump noise from the fuel tank and verify pressure in the hose from the fuel filter. Remove the jumper wire and close the cap on the test connector, then turn off the ignition switch. If the fuel pump did not operate, inspect the EFI 15-amp fuse, ignition switch 30-amp fuse (AM2), EFI main relay, circuit opening relay, battery voltage to the fuel pump, and the wiring and electrical connectors. To check the fuel pressure, use a fuel pressure gauge with a banjo fitting. Relieve any pressure in the fuel tank and ensure the battery voltage is 12 volts or more. Connect the fuel pressure gauge to the fuel filter inlet fitting and measure the fuel pressure with the ignition on and the engine not running. If the pressure is high, check for a restricted fuel return line or replace the pressure regulator. If the pressure is low, pinch the fuel return line and check if the pressure increases. If it does, replace the fuel pressure regulator. If not, check the fuel feed line, fuel pump, and fuel filter. Remove the jumper wire from the service electrical connector or fuel pump connector and start the engine. Measure the fuel pressure at idle and if it is not as specified, check the vacuum sensing hose and fuel pressure regulator. Stop the engine and verify that the fuel pressure remains at 21 psi or more for five minutes after turning off the engine. If the pressure bleeds down, there may be a leak in the fuel pressure regulator, fuel pump, or fuel injector. To check the EFI main relay, remove it from the electrical connector and check for battery voltage with the ignition key on. If voltage is present, insert the relay back into the connector and check for voltage at the circuit opening relay. For the fuel pump relay, check for continuity across specific terminals and apply battery voltage to check for continuity between other terminals. The circuit opening relay can be checked for continuity across specific terminals and by applying battery voltage to check for continuity between other terminals. Finally, check the resistance across the terminals of the fuel pump resistor and replace if there is no continuity.

1988 through 1990 models.

Check the fuel pump and lines for any obvious damage or fuel leakage. Also check all hoses from the tank to the pump, particularly the suction hoses at the fuel tank and pump.

The fuel pump is located on the side of the engine block.