Question 1

How to check and troubleshoot a carbureted engine's fuel pump and lines for damage or leakage on Toyota Land Cruiser?

Accepted Answer

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.

Question 2

How to remove and install a carbureted engine's fuel pump on Toyota Land Cruiser?

Accepted Answer

The fuel pump is located on the side of the engine block. To begin, disconnect the cable from the negative terminal of the battery, taking caution if your vehicle's stereo has an anti-theft system. Place rags under the fuel pump to catch any spilled gasoline. Carefully unscrew the fuel line clamps and slide them off the pump. Remove the fuel lines by twisting the rubber hoses from the pump's inlet, outlet, and return ports. Unbolt and remove the fuel pump. Before installation, coat both sides of the gasket surface with RTV sealant, position the gasket and fuel pump against the block, and securely tighten the bolts. Attach the lines to the pump using new hose clamps. Finally, run the engine and check for any leaks.

Question 3

How to check fuel-injected engine's fuel pump operation on Toyota Land Cruiser?

Accepted Answer

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.

Question 4

How do you remove and install a fuel-injected engine's fuel pump in a Toyota Land Cruiser?

Accepted Answer

1988 through 1990 models do not have an access hole for fuel pump removal, so the fuel tank needs to be removed to gain access to the fuel pump. On 1991 and later models, the middle seat needs to be removed to uncover the fuel pump access cover for fuel pump testing and replacement procedures. To remove the fuel pump, first relieve the fuel system pressure and disconnect the cable from the negative terminal of the battery. On 1988 through 1990 models, remove the fuel tank from the vehicle. On 1991 and later models, remove the middle seat and lift off the fuel pump/sending unit access cover. Disconnect the electrical connector and fuel lines, and remove the fuel pump/sending unit retaining bolts. Carefully withdraw the fuel pump/fuel level sending unit assembly from the fuel tank, making sure not to damage the inlet screen or float arm. Pry the lower end of the fuel pump loose from the bracket and remove the rubber cushion. Remove the clip securing the inlet screen to the pump and inspect the screen for contamination. If dirty, replace it. If only replacing the fuel pump inlet screen, install the new screen, clip, and rubber cushion, and push the lower end of the pump back into the bracket. If replacing the fuel pump, remove the hose clamp at the upper end of the pump and disconnect the pump from the hose. Disconnect the wires from the pump terminals and remove the pump. Installation is the reverse of removal, making sure to use new sealing washers on either side of the banjo fitting if applicable, and tighten the fitting bolt.

Genuine Toyota Land Cruiser Fuel Pump

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Toyota Land Cruiser Fuel Pump Assembly

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