Hyundai Sonata LF: Fuel Delivery System / High Pressure Fuel Pump Repair procedures

Hyundai Sonata LF 2014-2019 Service Manual / Engine Control / Fuel System / Fuel Delivery System / High Pressure Fuel Pump Repair procedures

Removal
   
Whenever the high pressure fuel pump, fuel pipe, deliverypipe, or injector is removed immediately after shutting offthe engine, an injury may be caused by the release ofhighly pressurized fuel. Release the residual pressure inthe high pressure fuel line by referring to the "Residualfuel pressure release procedure" before removingany high pressure fuel system components.
1.
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2.
Release the residual pressure in fuel line.
(Refer to the Fuel Delivery System - Repair Procedures - "Release Residual Pressure in Fuel Line").
   
When removing the fuel pump fuse, a Diagnostic Trouble Code (DTC) may occur.
Delete the code with the GDS after completion of “Release Residual Pressure in Fuel Line” work.
3.
Disconnect the fuel pressure control valve connector (A) and the fuel feed tube quick-connector (B).

   
Open the clamp cover (B) before disconnect the quick connector. (If the clip is applied)

   
When removing the quick-connnector with the clip removing tool (A), be careful not to damage the plastic clip (B).
If the clip is damaged, fuel line leak can be occurred due to a bad connection.

4.
Remove the high pressure fuel pipe.
(1)
Remove the high pressure pipe flange nut in order of A, B with the special service tool [SST No.: 09314-3Q100]

(2)
Disconnect the engine coolant temperature sensor connector.
(3)
Remove the function bolck installation bolt (C).

5.
Remove the installation bolts (D), 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 order to 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 fuel leak 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.
Install in the reverse order 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)

    Delivery Pipe 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...

    Driveshaft and axle

    ..

    Other information:

    Hyundai Sonata LF 2014-2019 Service Manual: Troubleshooting


    Troubleshooting SymptomSuspect AreaRemedy (Refer to page)Water leaks from panorama sunroofDirt accumulated in drain tubeClear dirt inside of drainClogged drain tubeBlow air into drain to remove dirtBroken or dislocated drain tube, defective or cracked clipCheck tube installation and flange contactDeteriorated roof lid weatherstripReplaceExcessive roof lid-to-body clearance and improperly fitted weatherstripAdjustWind noise around panorama sunroofLoosen or deformed deflector, gaps in body workRetighten adjust or replaceMisaligned weather stripReadjust or replace weather stripSunroof lid makes a noise when moveForeign particles lodged in guide railCheck drive cable and guide rails for foreign particlesLoosen guide rails and lidRetightenMotor runs but panorama sunroof does not move or moves only partiallyForeign particles lodged in guide railAdjust or replaceIncorrect engagement of motor pinion with drive cableDecrease in motor`s clutch slipping forceIncreased sunroof sliding resistance or interference of sunroof with drive cables, weatherstrip, etc...

    Hyundai Sonata LF 2014-2019 Service Manual: Troubleshooting


    Trouble Symptom Charts Trouble Symptom 1 Trouble Symptom 2 Trouble symptomProbable causeRemedyThe set vehicle speed varies greatly upward or downward"Surging" (repeated alternating acceleration and deceleration) occurs after settingMalfunction of the vehicle speed sensor circuitRepair the vehicle speed sensor system, or replace the partMalfunction of ECMCheck input and output signals at ECM Trouble Symptom 3 Trouble symptomProbable causeRemedyThe CC system is not canceled when the brake pedal is depressedDamaged or disconnected wiring of the brake pedal switchRepair the harness or replace the brake pedal switchMalfunction of the ECM signalsCheck input and output signals at ECM Trouble Symptom 4 Trouble symptomProbable causeRemedyThe CC system is not canceled when the shift lever is moved to the "N" position (It is canceled, however, when the brake pedal is depressed)Damaged or disconnected wiring of inhibitor switch input circuitRepair the harness or repair or replace the inhibitor switchImproper adjustment of inhibitor switchMalfunction of the ECM signalsCheck input and output signals at ECM Trouble Symptom 5 Trouble symptomProbable causeRemedyCannot decelerate (coast) by using the "SET/–" switchTemporary damaged or disconnected wiring of "SET/–" switch input circuitRepair the harness or replace the "SET/–" switchMalfunction of the ECM signalsCheck input and output signals at ECM Trouble Symptom 6 Trouble symptomProbable causeRemedyCannot accelerate or resume speed by using the "RES/+" switchDamaged or disconnected wiring, or short circuit, or "RES/+" switch input circuitRepair the harness or replace the "RES/+" switchMalfunction of the ECM signalsCheck input and output signals at ECM Trouble Symptom 7 Trouble symptomProbable causeRemedyCC system can be set while driving at a vehicle speed of less than 40km/h (25mph), or there is no automatic cancellation at that speedMalfunction of the vehicle-speed sensor circuitRepair the vehicle speed sensor system, or replace the partMalfunction of the ECM signalsCheck input and output signals at ECM Trouble Symptom 8 Trouble symptomProbable causeRemedyThe cruise main switch indicator lamp does not illuminate (But CC system is normal)Damaged or disconnected bulb of cruise main switch indicator lampRepair the harness or replace the part...

    Categories

    read more

     
    Copyright © 2026 www.hsonatalf.org