Fuel Pressure Test

FUEL LINE PRESSURE INSPECTION

WARNING: Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death. Fuel can also irritate skin and eyes. To prevent this, always complete the "BEFORE REPAIR PROCEDURE". (See BEFORE REPAIR PROCEDURE.)

1. Disconnect the negative battery cable.




2. Remove the fuel line schrader valve cap located under the throttle body.




3. Make sure the lever of SST is turned fully clockwise, then connect SST (Fuel pressure gauge) to the schrader valve.
4. Connect the negative battery cable.
5. Verify that the shift lever is in N position for ATX vehicles, or neutral position for MTX vehicles.
6. Start the engine and idle it. Measure the fuel line pressure.
- If not as specified, inspect the following:

Zero or low
- FP circuit
- FP
- Fuel line (clogging)
- Fuel leakage inside pressure regulator

High
- Pressure regulator

Fuel line pressure: 430 - 510 kPa {4.4 - 5.2 kgf/sq.cm, 63 - 73 psi}

7. Observe the fuel pressure gauge indicator during heavy acceleration.
8. Verify that the fuel pressure fluctuation is within the specification during the test.
- If not as specified, inspect the following:
- PCM
- FP
- Pulsation damper
- Fuel line for improper routing, kinks or leakage

Fuel pressure fluctuation: 420 - 510 kPa {4.3 - 5.2 kgf/sq.cm, 61 - 73 psi}

9. Turn the ignition switch to the LOCK position.
10. Measure the fuel hold pressure after 5 min.
- If not as specified, inspect the following:
- FP hold pressure
- Fuel injector for leakage
- Fuel line for improper routing, kinks or leakage

Fuel hold pressure: More than 250 kPa {2.5 kgf/sq.cm, 36 psi}

11. Disconnect the SST and connect the fuel pipe. (See FUEL INJECTOR REMOVAL/INSTALLATION)
12. Complete the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.)