Hyundai Palisade (LX2): Fuel Delivery System / Fuel pressure test (low pressure system)

Hyundai Palisade (LX2) 2020-2026 Service Manual / Engine Control/Fuel System / Fuel Delivery System / Fuel pressure test (low pressure system)

Fuel Pressure Test (Low pressure system)
1.
Release the residual pressure in fuel line.
(Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line")
Hyundai Palisade. Fuel pressure test (low pressure system)   
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When removing the fuel pump fuse, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the diagnostic tool 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 delivery pipe.
Hyundai Palisade. Fuel pressure test (low pressure system)   
•
There may be some residual pressure even after completing to “Release Residual Pressure in Fuel Line”, 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 fuel delivery pipe (Refer to the figure below).
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For 09353-02100

Hyundai Palisade. Fuel pressure test (low pressure system)

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For 0K353-D4100

Hyundai Palisade. Fuel pressure test (low pressure system)
3.
Inspect fuel leakage on connections among the fuel feed tube, the delivery pipe, and the SST components with ignition "ON".
4.
Measure Fuel Pressure.
(1)
Start the engine and measure the fuel pressure at idle.
Fuel Pressure : Over 290 kPa (Over 2.9 bar, Over 2.95 kgf/cm, Over 42.06 psi)
Hyundai Palisade. Fuel pressure test (low pressure system)   
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If the fuel pressure does not satisfy the specification, 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
Hyundai Palisade. Fuel pressure test (low pressure system)   
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f the gauge reading could 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)
Switch "OFF" the ignition.
5.
Release the residual pressure in fuel line.
(Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line")
Hyundai Palisade. Fuel pressure test (low pressure system)   
•
When removing the fuel pump fuse, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the diagnostic tool after completion of "Release Residual Pressure in Fuel Line" work.
6.
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.

    Components Location Fuel Tank & Filter-Neck Assembly 1. Fuel tank 2. Fuel pump 3. Fuel filter 4.

    Release Residual Pressure in Fuel Line    • Whenever the high pressure fuel fuse, fuel pipe, delivery pipe, or injector is removed immediately after shutting off the engine, an injury may be caused by the release of highly pressurized fuel.

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