Fuel Pressure: Testing and Inspection

1. CHECK FUEL PRESSURE WITH ENGINE OFF
- Check that the battery voltage is above 12 volts.
- Disconnect the negative (-) terminal cable from the battery.

CAUTION: Fuel will be released under pressure.
^ Put a suitable container or shop rag under the delivery pipe.
^ Loosen the union bolt slowly.




- Remove the union bolt and 2 gaskets, and disconnect the fuel inlet hose from the delivery pipe.




- Install the fuel inlet hose and pressure gauge (SST) to the delivery pipe with 3 new gaskets and union bolt (SST).
(SST 09268-45012 - Fuel Pressure Test Kit)

Torque: 29 Nm (300 kg.cm, 22 ft.lb)

- Wipe off any splattered gasoline.




- Using a jumper wire (or SST 09843-18020), connect terminals +B and FP of the DLC1.
- Reconnect the negative (-) terminal cable to the battery.
- Turn the ignition switch ON.

- Measure the fuel pressure.




Fuel pressure: 265 - 304 kPa (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

- Remove the jumper from the DLC1.

2. CHECK FUEL PRESSURE WITH ENGINE IDLING
- Start the engine.
- Disconnect the vacuum sensing hose from the fuel pressure regulator. and plug the hose end.
- Measure the fuel pressure at idle.




Fuel pressure: 265 - 304 kPa (38 - 44 psi)

- Reconnect the vacuum sensing hose to the fuel pressure regulator.
- Measure the fuel pressure at idle.




Fuel pressure: 206 - 255 kPa (31 - 37 psi)

- If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.

- Stop the engine.

3. CHECK RESIDUAL FUEL PRESSURE
- Check that the fuel pressure remains as specified for 5 minutes after the engine is stopped.

Fuel pressure: 147 kPa (21 psi) or more

If pressure is not as specified, check the fuel pump, pressure regulator and/or injector.

- After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the fuel pressure test guage to prevent gasoline from spraying.




- Reconnect the fuel inlet hose to the delivery pipe with 2 new gaskets and the union bolt.
Torque: 29 Nm (300 kg.cm, 22 ft.lb)
- Reconnect the negative (-) terminal cable to the battery.

4. CHECK FOR FUEL LEAKAGE
- Check for fuel leaks after performing maintenance anywhere on the fuel system.
- Refer to "Checking For Fuel System Leaks" under System Diagnosis.