Fuel Pressure: Testing and Inspection

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





c. Remove the union bolt and 2 gaskets, disconnect the fuel inlet hose from the fuel pipe support.

NOTE:
- Put a shop towel under the fuel pipe support.
- Slowly loosen the union bolt.





d. Install the fuel inlet hose and SST (pressure gauge) to the fuel pipe support with the 3 gaskets and SST (union adapter).
SST 09268-45014 (09268-41190, 90405-06167)

Torque: 29 N.m (300 kgf.cm, 21 ft.lbf)

e. Wipe off any splattered gasoline.





f. Connect the LEXUS hand-held tester to the DLC3. (See step 1. check fuel pump operation (a) to (e)).
g. Reconnect the negative (-) terminal cable to the battery.
h. Turn the ignition switch ON.
i. Measure the fuel pressure.

Fuel pressure: 304-343 kPa (3.1-3.5 kgf/Sq.cm, 44-50 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
j. Remove the LEXUS hand-held tester from the DLC3.
k. Start the engine.
l. Measure the fuel pressure at idle.

Fuel pressure: 304-343 kPa (3.1 -3.5 kgf/Sq.cm, 44-50 psi)

If pressure is not as specified, check the fuel pressure regulator.

m. Stop the engine.
n. Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.

Fuel pressure: 147 kPa (1.5 kgf/Sq.cm, 21 psi) or more

If pressure is not as specified, check the fuel pump, pressure regulator and/or injectors.

o. After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing.
SST 09268-45014

p. Install the fuel inlet pipe to the fuel pipe support with 2 new gaskets and the union bolt.

Torque: 29 N.m (300 kgf.cm, 21 ft.lbf)

q. Reconnect the negative (-) terminal cable to the battery.
r. Check for fuel leaks.