Kia Sorento: Fuel Pressure Test

Kia Sorento (MQ4, 2021-2026) Service Manual / Engine Control / Fuel System / Fuel Delivery System / Fuel Pressure Test

Special Service Tools

Tool Name / Number	Illustration	Description
Fuel pressure gauge 09353 - 24100		Used for measuring the pressure in fuel line
Fuel pressure gauge adapter 0K353 - D4100		Used for connecting between the delivery pipe and the fuel feed line

Fuel Pressure Test

Release the residual pressure in fuel line.

(Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line")

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.

Install the special service tools.

(1)

Separate fuel feed tube from the delivery pipe.

The residual fuel may be released after the "Release Residual Pressure in Fuel Line" procedure, so cover the connection area with a cloth or the like before disconnecting the fuel line.

(2)	Install the special service tools (0K353 - D4100, 09353 - 24100) for measuring the fuel pressure in between the fuel feed tube and the fuel delivery pipe (Refer to the figure below).

3.	Check the fuel line and special tool connections for leaks with the ignition switch ON.

Measure Fuel Pressure.

(1)

Start the engine and measure the fuel pressure at idle.

Fuel Pressure [kPa (bar, kgf/cm², psi)] : 480 - 520 (4.8 - 5.2, 4.9 - 5.3, 69.6 - 75.4)

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
Too low	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

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.

Release the residual pressure in fuel line.

(Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line")

•	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.

•	Connect the low pressure fuel feed tube and the low pressure inlet of high pressure fuel pump.

Finish test.

(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.

Fuel Delivery System

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Release Residual Pressure in Fuel Line

Release Residual Pressure in Fuel Line ...

Kia Sorento: Fuel Pressure Test

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