Fuel Pressure: Testing and Inspection

- 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 fuel filter.
^ Slowly loosen the union bolt.




- Remove the union bolt and 2 gaskets, and disconnect the fuel inlet hose from the fuel filter outlet.




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

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

- Wipe off any splattered gasoline.
- Using a jumper wire (or SST 09843-1802), 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.
- 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.
- Check that the fuel pressure remains as specified for 5 minutes after the engine has 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 pressure gauge to prevent gasoline from spraying.
- Reconnect the fuel inlet hose to the fuel filter with with 2 new gaskets and the union bolt.

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

- Check for fuel leaks.
- Refer to " Checking For Fuel System Leaks" under System Diagnosis.