Fuel Pressure Test

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

1. Separate the low pressure fuel feed tube from the high pressure fuel pump.
   NOTE:

   • Some residual fuel may flow out after the "Release Residual Pressure in Fuel Line" procedure, cover the connection area with a cloth before disconnecting the fuel line.
   • Open the clamp cover (A) before disconnect the quick connector. (If the clip is applied)

     Courtesy of KIA MOTORS AMERICA, INC.

   • When removing the quick-connector with the clip removing tool, be careful not to damage the plastic clip (A).

   Courtesy of KIA MOTORS AMERICA, INC.

2. Install the special service tools (09353 - 02100, 09353 - 24100) for measuring the fuel pressure between the fuel feed tube and the high pressure fuel pump (Refer to the figure below).

Courtesy of KIA MOTORS AMERICA, INC.

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 differs from the standard value, repair or replace the related part (Refer to the table 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 table 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.

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

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.