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Home >> Chrysler >> 2004 >> Crossfire Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Electrical Diagnostics >> Diagnosis And Testing >> DTC P0455: EVAP System Large Leak >> Diagnostic Test >> 6. Fuel Tank Pressure Sensor Operation

6. Fuel Tank Pressure Sensor Operation

NOTE: The fuel level must be below 85%, or the Tank Vent/Rollover Valves and the Fuel Tank Overfill Check Valve will seal the tank.

Turn the ignition off.

Install the fuel filler cap adapter. Attach the fuel filler cap to the adapter.

Connect a hand-held vacuum pump to the fuel filler cap adapter.

Slowly apply vacuum while monitoring the fuel tank pressure sensor on the DRB III(R). Do not exceed 2 in. Hg while performing this step.

NOTE: The fuel tank pressure sensor reads normally -1 hPa. When the vacuum is applied and 1 in. Hg is reached, the fuel tank pressure sensor should be approximately -5 hPa. Once the vacuum has been released, the fuel tank pressure sensor return to a normal reading.

Did the fuel tank pressure sensor operate as described above? 

  1. Yes  >> Go To 7
  2. No  >> Replace the Fuel Level Sending Unit/Pressure Sensor. See FUEL SYSTEM article.

    See POWERTRAIN VERIFICATION TEST - VER 2  .

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