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HOMESERVICE MANUALSKIA2017RIO EX, 4D HATCHBACKREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEFUEL DELIVERYFUEL DELIVERY SYSTEMREPAIR PROCEDURESFUEL PRESSURE TEST (LOW PRESSURE SYSTEM)
2017 Kia Rio EX, 4D Hatchback

Fuel Pressure Test (Low Pressure System)

2017 Kia Rio EX, 4D HatchbackSECTION Fuel Pressure Test (Low Pressure System)
  1. Release the residual pressure in fuel line (Refer to the Fuel Delivery System - REPAIR PROCEDURES - "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.
  2. Install the Special Service Tool (SST).
    1. Disconnect the low pressure fuel feed tube from the low pressure inlet of high pressure fuel pump.
      CAUTION: There may be some residual pressure even after "RELEASE RESIDUAL PRESSURE IN FUEL LINE " work, 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 low fuel feed tube and the low pressure inlet of high pressure fuel pump (Refer to the Fig 1 below).
    Fig 1: Measuring Fuel Pressure In Between Low Fuel Feed Tube And Low Pressure Inlet
    G11845304Courtesy of KIA MOTORS AMERICA, INC.
  3. Inspect fuel leakage on connections among the low fuel feed tube, the low pressure inlet of high pressure fuel pump, and the SST components with IG ON.
  4. Measure Fuel Pressure.
    1. Start the engine and measure the fuel pressure at idle.

      Fuel Pressure: 

      429 ~ 469 kPa (4.38 ~ 4.79 kgf/cm2 , 62.3 ~ 68.1 psi)

      NOTE: If the fuel pressure differs from the standard value, repair or replace the related part (Refer to the chart below).
      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 chart below).
      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 the Fuel Delivery System - REPAIR PROCEDURES - "RELEASE RESIDUAL PRESSURE IN FUEL LINE ").
  6. Test End
    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.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.