Fuel Pressure: Testing and Inspection

NOTE:
^ When reconnecting fuel line, always use a new clamp.
^ Tighten the clamp so its end is 3 mm (0.12 in) from the hose end.
^ Make sure that the screw of the clamp does not contact with any adjacent parts,
^ Use pressure gauge to check fuel pressure.
^ Tighten fuel hose clamps to 1.0-1.5 Nm (0.10-0.15 kg-m, 0.7-1.1 ft-lb)




1. Release fuel pressure to zero.
2. Disconnect fuel hose between fuel filter and fuel tube (engine side).
3. Install pressure gauge between fuel filter and fuel tube.
4. Start engine and check for fuel leakage.
5. Read the indication of the fuel pressure gauge.

At idle:

Approximately 206 kPa (2.1 kg/cm2, 30 psi)

The moment accelerator pedal is fully depressed:

Approximately 255 kPa (2.6 kg/cm2, 37 psi)

6. Stop engine and disconnect fuel pressure regulator vacuum hose from intake collector.
7. Plug intake collector with a rubber cap.
8. Connect variable vacuum source to fuel pressure regulator.




9. Disconnect Electronic Concentrated Engine Control System (E.C.C.S.) harness connectors at the Electronic Control Unit (E.C.U.).
10. Jump No. connector of E.C.U. to body ground.

Vacuum/fuel Pressure Test:

11. Turn ignition switch to "ON" and read the indication of the fuel pressure gauge as vacuum is changed.

NOTE:
Fuel pressure should decrease as vacuum increases. If results are unsatisfactory, replace fuel pressure regulator.