Fuel Pressure Test

CHECK FUEL PRESSURE
- Check the battery positive voltage is above 12 Volts.
- Disconnect the negative (-) terminal cable from the battery.




- Remove the union bolt and 2 gaskets, and disconnect the fuel inlet hose from the fuel filter outlet.

CAUTION:
- Put a shop towel under the fuel filter.
- Slowly loosen the union bolt.




- Install the fuel inlet hose and SST (pressure gauge) to the fuel filter outlet with the 3 gaskets and the SST (union bolt - 09268-45012).

Torque: 29 N.m (22 ft.lb)

- Wipe off any splattered gasoline.
- Connect the LEXUS hand-held tester to the DLC3.
- Reconnect the negative (-) terminal cable to the battery.
- Turn the ignition switch ON.
- Measure the fuel pressure.

Fuel pressure: 265 - 304 kPa (38 - 44 psi)

- If pressure is high. replace the fuel pressure regulator.
- If pressure is low, check these parts:
- Fuel hoses and connections
- Fuel pump
- Fuel filter
- Fuel pressure regulator




- Remove the LEXUS hand-held tester from the DLC3.
- Reinstall the fuse cover on the instrument panel.
- Start the engine.




- Disconnect the vacuum sensing hose from the fuel pressure regulator. and plug the hose end.
- Measure the fuel pressure at idle.

Fuel pressure: 265 - 304 kPa (38 - 44 psi)

- Reconnect the vacuum sensing hose to the fuel pressure regulator.
- Measure the fuel pressure at idle.

Fuel pressure: 226 - 265 kPa (33 - 38 psi)

- If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.
- Stop the engine.
- Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.

Fuel pressure: 147 kPa (21 psi) or more

- If pressure is not as specified, check the fuel pump, pressure regulator and/or injectors.
- After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing.

- Reconnect the fuel inlet hose with 2 new gaskets and the union bolt.

Torque: 29 N.m (21 ft.lb)

- Reconnect the negative (-) terminal cable to the battery.
- Check for fuel leakage.