Fuel Pressure: Testing and Inspection

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, and disconnect the fuel inlet hose from the fuel pipe support.

NOTICE:
- 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 and adapter).
SST 09268-45014 (092684119O, 90405-06167)

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

(e) Wipe off any splattered gasoline.





(f) Connect a LEXUS hand-held tester to the DLC3.
(g) Measure the fuel pressure.

Fuel pressure:
301-347 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
(h) Disconnect the LEXUS hand-held tester from the DLC3.
(i) Start the engine.
(j) Measure the fuel pressure at idle.

Fuel pressure:
301-347 kPa (3.1-3.5 kgf/sq. cm 44-50 psi)

(k) Stop the engine.
(l) 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.
(m) After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove SST to prevent gasoline from splashing.
SST 09268-45014
(n) Reconnect the fuel inlet hose to the fuel pipe support with 2 new gaskets and the union bolt.

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

(o) Reconnect the negative (-) terminal cable to the battery.
(p) Check for fuel leaks.