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.





(c) 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.





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

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

(e) Wipe off any splattered gasoline.
(f) Reconnect the negative (-) terminal cable to the battery.
(g) Connect the TOYOTA hand-held tester to the DLC3.
(h) 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

(i) Disconnect the TOYOTA hand-held tester from the DLC3.
(j) Start the engine.
(k) Measure the fuel pressure at idle.

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

(l) Stop the engine.
(m) 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.
(n) After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing. SST 0926-45012
(o) Reconnect the fuel inlet hose with 2 new gaskets and the union bolt.

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

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