Fuel Pressure: Testing and Inspection

- Check that the battery voltage is above 12 volts.
- Disconnect the cable from the negative (-) terminal of the battery.

CAUTION: Work must be started after approx. 20 seconds or longer from the time the ignition switch is turned to the "LOCK" position and the negative terminal cable is disconnected from the battery.

Union Bolt:

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

HINT:
^ Put a suitable container or shop towel under the cold start injector pipe.
^ Slowly loosen the union bolt.

Gauge Installation:

- Install the fuel inlet hose and pressure gauge to the delivery pipe with three new gaskets and union bolt.


Torque: 29 N.m (300 kgf.cm, 22 ft.lbs)

- Wipe off any splattered gasoline.

Jumper Installation:

- Using a jumper wire, connect terminals + B and FP of the check connector.
- Reconnect the battery negative (-) cable.
- Turn the ignition switch ON.

Checking Fuel Pressure:

- Measure the fuel pressure.

Fuel pressure:
265 - 304 kPa (2.7 - 3.1 kgf/cm2, 38 - 44 psi)

- If pressure is high, replace the fuel pressure regulator.
- If pressure is low, check the following parts:

^ Fuel hoses and connections
^ Fuel pump
^ Fuel filter
^ Fuel pressure regulator

- Remove jumper wire.

Checking Fuel Pressure - No Vacuum To Regulator:

- Start the engine.
- Disconnect the vacuum sensing hose from the fuel pressure regulator.
- Measure the fuel pressure at idle.

Fuel pressure:
265 - 304 kPa (2.7 - 3.1 kgf/cm2, 38 - 44 psi)

Checking Fuel Pressure - Vacuum To Regulator:

- Reconnect the vacuum sensing hose to the fuel pressure regulator, and plug the hose end.
- Measure the fuel pressure at idle.

Fuel pressure:
206 - 255 kPa (2.1 - 2.6 kgflcm2, 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 147 kPa (1.5 kgf/cm2, 21 psi) or more for 5 minutes after the engine is turned off.
- If pressure is not as specified, check the fuel pump, pressure regulator and/or injector.
- After checking fuel pressure, disconnect the battery negative (-) cable and carefully remove gauge to prevent gasoline from splashing.