Toyota 23100-61070 Fuel Pump Assembly

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Inspect the fuel pump and lines for damage or leakage. Pay special attention to hoses connecting the tank to the pump, as cracks can hinder fuel supply. If there's high fuel consumption or a fuel smell without visible leaks, check the engine oil for fuel contamination, indicating a possible fuel pump diaphragm rupture. To measure fuel pressure, disconnect the fuel line from the carburetor and attach a T-fitting and pressure gauge. Start the engine, the pressure should be 2-1/2 to 8 psi and steady. Upon shutdown, pressure should drop slowly. A sudden drop suggests a bad outlet valve, warranting pump replacement. High pressure may mean a plugged air vent, while low pressure might require pump replacement after confirming unobstructed and good condition hoses and lines.

Close the cap on the test connector.

Refer to Chapter 11 for instructions.

Carefully unscrew the fuel line clamps from the fuel lines and slide them from the pump. Remove the fuel lines by carefully twisting the rubber hoses from the fuel pump inlet, outlet, and return ports.