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Home >> Kia >> 2021 >> Forte GT Line >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis - 2.0L (3 Of 6) >> DTC P0300-00: Random/Multiple Cylinder Misfire Detected >> System Inspection >> Fuel System Inspection

Fuel System Inspection

  1. Refer to "RELEASE RESIDUAL PRESSURE IN FUEL LINE " and release the residual pressure in the fuel line.
    CAUTION: When removing the fuel pump relay, A Diagnostic Trouble Code (DTC) may occur. Delete the code with the KDS after performing fuel residual pressure release procedure.
  2. Install the Special Service Tool (SST).
    1. Disconnect the fuel feed tube from the high pressure fuel pump.
      CAUTION: There may be some residual pressure even after performing fuel residual pressure release procedure. Therefore, 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 to measure the fuel pressure in between the fuel feed tube and the high pressure fuel pump (refer to figure below).
  3. Inspect for fuel leakage on connections among the fuel feed tube, the high pressure fuel pump, and the SST components with Ignition "ON".
  4. Measure fuel pressure.
    1. Start the engine and measure the fuel pressure at idle.

      Specification:  Fuel Pressure - 330 to 370 kPa (3.37 - 3.77 kgf/cm2 /47.9 - 53.7 psi)

      CAUTION: If the fuel pressure differs from the standard value, repair or replace the related parts (refer to the table below).
      Fuel Pressure Cause Related Parts
      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

      CAUTION: If the gauge reading is not held, repair or replace the related parts (refer to table below).
    Fuel Pressure (After Engine Stops) Cause Related Parts
    Fuel pressure drops slowly Leakage on injectors Injectors
    Fuel pressure drops immediate Fuel pump check valve stuck open Fuel pump
  5. Is fuel pressure value within specification?

    Good 

    No Good 

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