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Home >> Hyundai >> 2018 >> Kona Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Engine Control System Diagnosis - 2.0L (2 Of 6)) >> DTC P0171-00: System Too Lean (Bank 1) >> System Inspection >> Fuel System Inspection

Fuel System Inspection

WARNING: This page is about a different car, the 2021 Kia Seltos. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • Install the component with the specified torques.
  • Note that internal damage may occur when the component is dropped or mis-treated.
CAUTION:
  • Insert the sensor in the installation hole and be careful not to damage.
  1. Release the residual pressure in fuel line.
    CAUTION: When removing the fuel pump relay, A Diagnostic Trouble Code (DTC) may occur. Delete the code with the KDS after completion of "Release Residual Pressure in Fuel Line" work.
  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 "Release Residual Pressure in Fuel Line" work. 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 for measuring the fuel pressure in between the fuel feed tube and the high pressure fuel pump (Refer to figure below).
    G13506451Courtesy of KIA MOTORS AMERICA, INC.
  3. Inspect 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:  330 - 370 kPa (3.36 - 3.77 kgf/cm2 , 47.8 - 53.6 psi)

      NOTE: 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

      NOTE: 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 immediately Check valve of fuel pump stuck open Fuel pump
    3. Ignition "OFF"
  5. Is fuel pressure value within specification?

    Good 

    No Good 

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