Fuel Pressure Test
1.

Release the residual pressure in fuel line.

(Refer to Fuel Delivery System - “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 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, 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 high pressure fuel pump (Refer to the figure below).

3.

Inspect fuel leakage on connections among the fuel feed tube, the 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: 323 ~ 363kpa (3.29 ~ 3.70kgf/㎠, 46.85 ~ 52.65psi)

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 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.

5.

Release the residual pressure in fuel line.

(Refer to Fuel Delivery System - “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 high pressure fuel pump.

(2)

Connect the fuel feed tube and the high pressure fuel pump.

Release Residual Pressure in Fuel Line
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.

1.

Turn the ignition switch OFF and disconnect the battery (-) cable.

2.

Remove the rear seat cushion.

<a href="content.asp?vehicletype=Passenger&mfrcode=KM&area=KME&langcode=ENG&modelid=JD12&modelyr=2013&mmctype=bd&mmcid=4&group=SHOP&pdftype=&cat1=2013+%3E+G+1%2E4+MPI&ec=&firstnodedesc=Body+%28Interior+and+Exterior%29&sitinfolist=91%5E9191%5E91910010%5Enone%5E801%5E6%5EENG%5EKM%5EJD12%5E2013%5Ebd%5E4%5Enone%5Enone%5Enone%5ESHOP%5E%24" target="_blank">(Refer to Body - "Rear Seat Assembly")</a>

3.

Remove the service cover (A) after loosenig the screws (B).

4.

Disconnect the fuel pump connector (A).

5.

Connect the battery (-) cable.

6.

Start the engine and let idle, and then turn the ignition switch OFF after the engine has stopped on its own.

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