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Fuel Pressure Test: Notes

  1. Release the residual pressure in fuel line (Refer to "RELEASE RESIDUAL PRESSURE IN FUEL LINE " ).
    CAUTION: There may be some residual pressure even after releasing the residual pressure in the fuel line, so cover the hose connection with a shop towel to prevent residual fuel from spilling out before disconnecting any fuel connection.
  2. Install the Special Service Tool (SST).
    1. Disconnect the fuel feed tube from the delivery pipe.
      CAUTION: There may be some residual pressure even after releasing the residual pressure in the fuel line, so cover the hose connection with a shop towel to prevent residual fuel from spilling out before disconnecting any fuel connection.
    2. Install the special service tool for measuring the fuel pressure in between the fuel feed tube and the fuel delivery pipe (Refer to Fig 1).
      Fig 1: Measuring Fuel Pressure Between Fuel Feed Tube & Fuel Delivery Pipe
      G06497976Courtesy of KIA MOTORS AMERICA, INC.
  3. Inspect fuel leakage on connections among the fuel feed tube, the delivery pipe, and the SST components with IG ON.
  4. Measure Fuel Pressure.
    1. Start the engine and measure the fuel pressure at idle.

      Fuel Pressure:  338 ~ 348 kPa (3.45 ~ 3.55 kgf/cm2 , 49.0 ~ 50.5 psi)

      NOTE: If the fuel pressure differs from the standard value, repair or replace the related part (Refer to the table below).
      FUEL PRESSURE TEST (ENGINE AT IDLE)

      Fuel Pressure Cause Related Part
      Too Low Fuel filter clogged Fuel Filter
      Fuel leakage Fuel Pressure Regulator
      Too High Fuel pressure regulator valve 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 should not be held, repair or replace the related part (Refer to the table below).
      FUEL PRESSURE SPECIFICATION (ENGINE OFF)

      Fuel Pressure (After Engine Stops) 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. Turn the ignition switch OFF.
  5. Release the residual pressure in fuel line (Refer to "RELEASE RESIDUAL PRESSURE IN FUEL LINE ").
    CAUTION: When removing the fuel pump relay, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the GDS after completion of "RELEASE RESIDUAL PRESSURE IN FUEL LINE " work.
  6. Test End
    1. Remove the Special Service Tool (SST) from the fuel feed tube and the delivery pipe.
    2. Connect the fuel feed tube and the delivery pipe.
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