Hyundai Sonata: High Pressure Fuel Pump. Repair procedures - Fuel Delivery System - Engine Control/Fuel System - Hyundai Sonata YF 2011-2018 Service ManualHyundai Sonata: High Pressure Fuel Pump. Repair procedures

Removal

In case of removing the high pressure fuel pump, high pressure fuel pipe, delivery pipe, and injector, there may be injury caused by leakage of the high pressure fuel. So dont do any repair work right after engine stops.
1.
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2.
Release the residual pressure in fuel line (Refer to Release Residual Pressure in Fuel Line in this group).
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.
3.
Remove the air cleaner and the air intake hose (Refer to Intake And Exhaust System in EM group).
4.
Disconnect the fuel pressure regulator valve connector (A).
5.
Remove the ignition coil (B).

6.
Disconnect the fuel feed tube quick-connector (A).
7.
Remove the high pressure fuel pipe.
(1)
Remove the installation nut (B) from the high pressure fuel pump with the special service tool [SST No.: 09314-3Q100]

(2)
Remove the installation nut (C) from the delivery pipe with the special service tool [SST No.: 09314-3Q100]
(3)
Remove the purge control solenoid valve (Refer to Purge Control Solenoid Valve in this group).
(4)
Remove the function block (D), and then remove the high pressure fuel pipe.
8.
Remove the installation bolts (E), and then remove the high pressure fuel pump from the cylinder head assembly.
Unscrew in turn the two bolts in small step (0.5 turns). In case of fully unscrewing one of the two bolts with the other bolt installed, the housing surface of the cylinder head may be broken because of tension of the pump spring.


Installation

Be sure to check the low pressure fuel hose quick-connector (A) is completely connected to the high pressure fuel pump until a confirmation 'click' sound is heard.
Be sure to re-check the low pressure fuel hose is completely connected to the high pressure fuel pump by pulling it after connecting.
Be sure to install the high pressure fuel pipe (B) with the specified torques.
Because fuel leak may cause fire, securely Inspect leakage of all fuel line connection parts at engine start condition.

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 the used bolt.
Do not reuse the used high pressure fuel pipe.
When tightening the installation bolts of the high pressure fuel pump, tighten in turn the bolts in small step (0.5 turns) after tightening them with hand-screwed torque.
Install the component with the specified torques.
First hand-tighten the fasteners fully until they are not fastened any more in orderto have them inserted in place and then completely tighten to the specified torque using a torque wrench.
If not tightening the bolts or nuts in a straight line with the mating bolt holes or fittings, it may cause a fuelleak due to broken threads.
Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.
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.

1.
Installation is reverse of removal.
Use the special service tool [SST No.: 09314-3Q100] to install the high pressure fuel pipe.


High pressure fuel pump installation bolt: 12.8 ~ 14.7 N.m (1.3 ~ 1.5 kgf.m, 9.4 ~ 10.9 lb-ft)
High pressure fuel pipe installation nut: 26.5 ~ 32.4 N.m (2.7 ~ 3.3 kgf.m, 19.5 ~ 23.9 lb-ft)
High pressure fuel pipe function block installation bolt: 7.8 ~ 11.8 N.m (0.8 ~ 1.2 kgf.m, 5.8 ~ 8.7 lb-ft)


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