Question 1

How to check the fuel pump on Toyota Tercel?

Accepted Answer

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.

Question 2

How do you replace the fuel pump in a Toyota Tercel?

Accepted Answer

To replace the fuel pump in a car, first relieve the fuel system pressure and disconnect the cable from the negative terminal of the battery. For mechanical pump (carbureted models), relieve the fuel tank pressure by removing the fuel filler cap. Locate the fuel pump mounted on the left rear corner of the cylinder head and disconnect the hoses from the pump, plugging them immediately to prevent fuel leakage. Unscrew the fasteners that retain the pump to the cylinder head, inspect the fuel pump arm for wear, and coat it with clean engine oil before installing it. Use a gasket scraper or putty knife to remove old gasket material from the mating surfaces on the cylinder head and fuel pump. For electric pump (fuel-injected models), remove the fuel tank cap and disconnect the cable from the negative terminal of the battery. On 1990 models, remove the fuel tank and place it on a workbench. Remove the fuel pump assembly retaining bolts from the top of the fuel tank and carefully withdraw the fuel pump assembly. Pull the lower end of the fuel pump loose from the bracket and remove the rubber cushion. Remove the clip securing the filter to the pump and inspect the filter for contamination. Replace the filter if necessary. If only replacing the fuel pump filter, install the new filter, clip, and rubber cushion, and push the lower end of the pump back into the bracket. If replacing the fuel pump, loosen the hose clamp at the upper end of the pump, disconnect the pump from the hose, disconnect the wires from the pump terminals, and remove the pump. Installation is the reverse of removal.

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