Fuel Pressure: Testing and Inspection

FUEL PRESSURE INSPECTION

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

(d) Remove the fuel hose clamp.

(e) Disconnect the No.1 fuel pipe (fuel tube connector) from the fuel filter outlet.

CAUTION:
- Perform disconnecting operations of the fuel tube connector (quick type) after observing the precautions.
- As there is retained pressure in the fuel pipe line, prevent it from splashing inside the engine compartment.

(f) Install SST (pressure gauge) as shown in the illustration by using SST and fuel tube connector.
SST 0926841047, 0926841250, 0926845012
(g) Wipe off any splattered gasoline.
(h) Reconnect the negative (-) terminal cable to the battery.
(i) Connect the LEXUS hand-held tester to the DLC3.
(j) 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
(k) Disconnect the LEXUS hand-held tester from the DLC3.
(l) Start the engine.
(m) Measure the fuel pressure at idle.

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

(n) Stop the engine.
(o) 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.
(p) After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST and fuel tube connector to prevent gasoline from splashing.
SST 0926841047, 0926841250, 0926845012

(q) Reconnect the No.1 fuel pipe (fuel tube connector).

CAUTION: Perform connecting operations of the fuel tube connector (quick type) after observing the precautions.

(r) Surely install the fuel hose clamp to the fuel filter with "click" sound.
(s) After installing the clamp, check that the clamp is fixed by pulling up the clamp.
(t) Reconnect the negative (-) terminal cable to the battery.
(u) Check for fuel leakage.