Toyota 23221-46010 Fuel Pump

To check the fuel system, start by ensuring there is enough fuel in the Fuel Tank. If there are doubts about the fuel gauge reading, a long wooden dowel can be inserted into the fuel filler opening to serve as a dipstick. For carbureted engines with a mechanical pump, raise the vehicle and inspect all fuel lines for leaks, loose connections, or kinks. Start the engine and check for leaks on the fuel pump. If there is little or no gasoline coming from the fuel line during engine cranking, the fuel line may be clogged or the fuel pump may need to be replaced. For fuel-injected engines with an electric pump, perform a fuel pump operation check by bridging terminals +B and Fp of the check connector to activate the fuel pump. Listen for fuel return noises and check for pressure in the hose from the fuel filter. If there is no pressure, inspect the electrical components such as fuses, relays, wiring, and connectors. To check the fuel pressure, a fuel pressure gauge with a banjo fitting is required. Attach the gauge and measure the fuel pressure, comparing it to the specifications. If the pressure is not as specified, check for restricted fuel return lines or replace the pressure regulator. Finally, check the fuel pump electrical components by testing for battery voltage to the relays and the fuel pump itself. If there is voltage present, have the relays checked by a professional. Additionally, check the fuel pressure regulator components by applying vacuum and comparing the fuel pressure readings. If the pressure is too high or low, replace the fuel pressure regulator. Lastly, test the fuel pressure control system by checking the resistance of the vacuum switching valve and ensuring proper airflow. Replace any faulty components as needed.