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Home >> Kia >> 2005 >> Spectra5 2.0 1, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System/Fuel System - 2.0L >> Fuel Delivery System >> Fuel Pressure Test
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Fuel Pressure Test

  1. Remove the rear seat cushion.
  2. Open the service cover (A) under the rear seat cushion.
    Fig 1: Removing Service Cover
    G00719781Courtesy of KIA MOTORS AMERICA, INC.
  3. Release the internal pressure of the fuel lines and hoses as following:
    1. Disconnect the fuel pump assembly harness connector (A).
    2. Start the engine and wait until fuel in fuel line is exhausted. After the engine stalls, turn the ignition switch to OFF position.
    3. Disconnect the negative (-) terminal from the battery.
    4. Disconnect the fuel pump assembly harness connector (A).
      NOTE: Be sure to reduce the fuel pressure before disconnecting the fuel feed line, otherwise fuel will spill out.
      Fig 2: Disconnecting Fuel Pump Assembly Harness Connector
      G00719782Courtesy of KIA MOTORS AMERICA, INC.
  4. Disconnect the fuel feed line from the fuel delivery pipe.
    CAUTION: Cover the hose connection with a shop towel to prevent splashing of fuel caused by residual pressure in the fuel line.
  5. Install the fuel pressure gauge to the fuel line. See SPECIAL SERVICE TOOLS .
    Fig 3: Installing Fuel Pressure Service Tool
    G00719783Courtesy of KIA MOTORS AMERICA, INC.
  6. Connect the negative terminal (-) to the battery.
  7. Apply battery voltage to the fuel pump terminal and activate the fuel pump. With fuel pressure applied, check that there is no fuel leakage from the fuel pressure gauge or connection part.
  8. Start the engine and let it idle.
  9. Measure the fuel pressure.

    Standard Value: 350 kpa (3.5 kg/cm2 , 49.8 psi)

  10. If the result of the measurements made in steps (8) and (9) are not within the standard value, use the table below to determine the probable cause, and perform the necessary repairs.
    Fig 4: Engine Running Probable Cause Chart
    G00719784Courtesy of KIA MOTORS AMERICA, INC.
  11. Stop the engine and check for a change in the fuel pressure gauge reading, which should hold for approximately 5 minutes. If the gauge indication drops, observe the rate of drop. Determine and correct the causes according to the following table shown in illustration.
    Fig 5: Engine Stopped Probable Cause Chart
    G00719785Courtesy of KIA MOTORS AMERICA, INC.
  12. Release the internal pressure of the fuel lines and hoses as following:
    1. Disconnect the fuel pump assembly harness connector (A).
    2. Start the engine and wait until fuel in fuel line is exhausted. After the engine stalls, turn the ignition switch to OFF position.
    3. Disconnect the negative (-) terminal from the battery.
    4. Disconnect the fuel pump assembly harness connector (A).
      NOTE: Be sure to reduce the fuel pressure before disconnecting the fuel feed line, otherwise fuel will spill out.
      Fig 6: Disconnect Fuel Pump Assembly Harness Connector (A)
      G00719786Courtesy of KIA MOTORS AMERICA, INC.
    5. Disconnect the fuel pressure gauge from the fuel line.
      CAUTION: Cover the hose connection with a shop towel to prevent splashing of fuel caused by residual fuel pressure in the fuel line.
    6. Replace the O-ring at the end of the hose.
    7. Connect the fuel feed line to the fuel delivery pipe and check for fuel leakage.
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