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Fuel Pressure Test (Low pressure system)

  1. Release the residual pressure in fuel line.

    (Refer to Fuel Delivery System - "RELEASE RESIDUAL PRESSURE IN FUEL LINE ")

    NOTE:
    • Remove the DTC surely with the KDS after the "Release Residual Pressure in Fuel Line" procedure since the DTC is occurred when removing the fuel pump relay.
    • Cover the connection with a clean cloth since the residual fuel may be released after "Release Residual Pressure in Fuel Line" procedures.
  2. Install the Special Service Tool (SST).
    1. Disconnect the fuel feed tube from the delivery pipe.
    2. Install the special service tool for measuring the fuel pressure in between the fuel feed tube and the fuel delivery pipe (Refer to the figure below).
    G15693394Courtesy of KIA MOTORS AMERICA, INC.
  3. Inspect fuel leakage on connections among the fuel feed tube, the delivery pipe, and the SST components with ignition "ON".
  4. Measure Fuel Pressure.
    1. Start the engine and measure the fuel pressure at idle.

      Fuel Pressure:  480 - 520 kPa (4.8 - 5.2 bar, 4.9 - 5.3 kgf/cm2 , 69.6 - 75.4 psi)

      NOTE: If the fuel pressure does not satisfy the specification, repair or replace the related part. (Refer to the table below.)
      Fuel Pressure Suspected Cause Related Part
      Too low Fuel filter clogged Fuel filter
      Fuel leakage Fuel pressure regulator
      Too high Fuel pressure regulator stuck Fuel pressure regulator
    2. Stop the engine, and then check for the change in the fuel pressure gauge reading.

      Standard Value  : The gauge reading should hold for about 5 minutes after the engine stops

      NOTE: If the gauge reading could not be held, repair or replace the related part. (Refer to the table below.)
      Fuel Pressure (After Engine Stops) Suspected Cause Related Part
      Fuel pressure drops slowly Leakage on injector Injector
      Fuel pressure drops immediately Check valve of fuel pump stuck open Fuel pump
    3. Switch "OFF" the ignition.
  5. Release the residual pressure in fuel line.

    (Refer to Fuel Delivery System - "RELEASE RESIDUAL PRESSURE IN FUEL LINE ")

    NOTE: Cover the connection with a clean cloth since the residual fuel may be released after "Release Residual Pressure in Fuel Line" procedures.
  6. Finish test.
    1. Remove the Special Service Tool (SST) from the low pressure fuel feed tube and the low pressure inlet of high pressure fuel pump.
    2. Connect the low pressure fuel feed tube and the low pressure inlet of high pressure fuel pump.
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