Fuel Pressure: Testing and Inspection

(a) Check the battery 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 pipe from the delivery pipe.

CAUTION:
- Put a shop towel under the delivery pipe.
- Slowly loosen the union bolt.





(d) Install the fuel inlet pipe and SST (pressure gauge) to the delivery pipe with the 3 gaskets and SST (union and union bolt). SST 09268-45012 (09268-41190, 90405-06167)

Torque: 29 N.m (300 kgf.cm, 22 ft.lbf)

(e) Wipe off any splattered gasoline.





(f) Connect the LEXUS hand-held tester to the DLC3.
(g) Reconnect the negative (-) terminal cable to the battery.
(h) Turn the ignition switch ON.
(i) Measure the fuel pressure.

Fuel pressure: 265 - 304 kPa
(2.7 - 3.1 kgf/sq.cm, 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
(j) Remove the LEXUS hand-held tester from the DLC3.
(k) Reinstall the fuse cover on the instrument panel.
(I) Start the engine.
(m) Disconnect the vacuum sensing hose from the fuel pressure regulator, and plug the hose end.





(n) Measure the fuel pressure at idle.

Fuel pressure: 265 - 304 kPa
(2.7 - 3.1 kgf/sq.cm, 38 - 44 psi)

(o) Reconnect the vacuum sensing hose to the fuel pressure regulator.
(p) Measure the fuel pressure at idle.

Fuel pressure: 206 - 255 kPa
(2.1 - 2.6 kgf/sq.cm, 31 - 37 psi)

If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.
(q) Stop the engine.
(r) 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