Hyundai Palisade (LX2): Fuel Delivery System / High Pressure Fuel Pump

Hyundai Palisade (LX2) 2020-2025 Service Manual / Engine Control/Fuel System / Fuel Delivery System / High Pressure Fuel Pump

Repair procedures

Removal
1.
Release the residual pressure in fuel line.
(Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line")
2.
Switch "OFF" the ignition and disconnect the negative (-) battery terminal.
3.
Remove the high pressure fuel pump foam (A).

Hyundai Palisade. Repair procedures
4.
Remove the control wiring harness (A).

Hyundai Palisade. Repair procedures
5.
Remove the fuel line mounting bolts (A).

Hyundai Palisade. Repair procedures
6.
Disconnect the high pressure fuel control valve connector (A) and low pressure fuel feed tube quick-connector (B).

Hyundai Palisade. Repair procedures
7.
Remove the high pressure fuel pipe.
(Refer to Fuel Delivery System - "Fuel Line")
8.
Remove the mounting bolts (A), and then remove the high pressure fuel pump (B) from the cylinder head assembly.
High pressure fuel pump mounting bolt :
12.8 - 14.7 N.m (1.3 - 1.5 kgf.m, 9.4 - 10.9 lb-ft)
Hyundai Palisade. Repair procedures   
•
Unscrew in turns the two bolts in small steps (0.5 turns). When one of the two bolts is fully unscrewed while the other bolt still intact, the housing surface of the cylinder head may be broken due to tension of the pump spring.

Hyundai Palisade. Repair procedures
Installation
Hyundai Palisade. Repair procedures   
•
Be sure that the low pressure fuel hose quick-connector (A) is completely connected to the high pressure fuel pump by the locking sound.
•
Double-check the complete connection of the low pressure fuel hose to the high pressure fuel pump by pulling it after connecting.
•
Be sure to install the high pressure fuel pipe (B) to the specified torques.
•
Because fuel leak may cause fire, thoroughly inspect leakage of all fuel line connection parts at engine start condition.

Hyundai Palisade. Repair procedures
Hyundai Palisade. Repair procedures   
•
Before installing the high pressure fuel pump, position the roller tappet in the lowest position by rotating the crankshaft. Otherwise the installation bolts may be broken because of tension of the pump spring.
•
Do not reuse bolts.
•
Do not reuse high pressure fuel pipe.
•
When tightening the installation bolts of the high pressure fuel pump, pretighten them by hand first, and then tighten them in turns to the specified torque in small steps (0.5 turns).
•
Install the component to the specified torque.
•
First, secure the fasteners in place by pretightening them by hand. Then, tighten them to the specified torque using a torque wrench.
Bolts or nuts not tightened in a straight line with the matching bolt holes or fittings may cause fuel leakage due to broken threads.
•
Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.
Hyundai Palisade. Repair procedures   
•
Apply engine oil to the O-ring (A) of the high pressure fuel pump, the roller tappet (B), and the protrusion (C). Also apply engine oil to the groove on the location where the protrusion (C) is installed.

Hyundai Palisade. Repair procedures
Hyundai Palisade. Repair procedures   
•
Use the special service tool [SST No. : OK353-F6100] to install the high pressure fuel pump.
1.
Install in the reverse order of removal.

    Repair procedures Removal    • When removing the high pressure fuel pump, high pressure fuel pipe, delivery pipe, and injector, injury may be caused by leakage of high pressure fuel.

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