Toyota 23220-42070 Fuel Pump Assembly

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To check the fuel pump operation, turn on the ignition switch without starting the engine. For models from 1979 to 1986, bridge both terminals of the fuel pump check connector with a jumper wire; for 1987 and later models, bridge terminals +B and Fp of the service connector. Listen for fuel return noises from the fuel pressure regulator, verifying pressure in the appropriate hoses for each model. For models from 1984 onward, remove the fuel filler neck cap, open the trap door, and listen for a whirring sound while an assistant bridges the terminals. After removing the jumper wire and closing the cap, turn off the ignition switch. If the fuel pump isn't operating, inspect the EFI 15-amp fuse, ignition 7.5-amp fuse, EFI main relay, circuit opening relay, fuel pump, and wiring. For the fuel pressure check, use a fuel pressure gauge with an 8 mm banjo fitting. Relieve the fuel pressure and ensure the battery voltage is 12 volts or more before detaching the negative battery cable and the electrical connector from the cold start injector. Place a container under the cold start injector pipe banjo bolt, remove it, and attach the fuel pressure gauge. Wipe any gasoline that leaks, reattach the negative battery cable, place the transaxle in Neutral or Park, and apply the parking brake. Bridge the appropriate terminals for your model to hear the fuel pump running and check the gauge for pressure. If the fuel pump doesn't run, the pump or control circuit may be faulty. Start the engine, detach the vacuum sensing hose from the pressure regulator, and measure the fuel pressure at idle, comparing it to the specific fuel pressure. If the pressure is high, check for obstructions in the fuel return line; if low, inspect for leaks and pinch the return hose to determine if the fuel pressure regulator is malfunctioning. Reattach the vacuum sensing hose, measure the fuel pressure again, and verify it remains at 21 psi or more for five minutes after turning off the engine. Relieve the fuel pressure, detach the negative battery cable, carefully remove the fuel pressure gauge, reattach the cold start injector pipe banjo fitting with new sealing washers, reconnect the electrical connector, and ensure to clean up any spilled gasoline before starting the engine and checking for leaks.

Swing the pump unit out from the bracket at the bottom end, loosen the upper hose clamp, and pull the pump and short section of hose off the metal pump outlet line. When installing the new pump, replace this short section of hose with a new piece of approved fuel hose.