Fuel Pressure Test
|
1. |
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.
|
|
|
2. |
Install the Special Service Tool (SST).
|
(1) |
Disconnect the fuel feed tube from the high pressure fuel
pump.
|
There may be some residual pressure even after
“Release Residual Pressure in Fuel Line” work, 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 high pressure
fuel pump (Refer to the figure below).
|
|
|
3. |
Inspect fuel leakage on connections among the fuel feed tube,
the high pressure fuel pump, and the SST components with IG ON.
|
|
4. |
Measure Fuel Pressure.
|
(1) |
Start the engine and measure the fuel pressure at idle.
Fuel Pressure:
445 ~ 455 kPa (4.5 ~ 4.6 kgf/cm², 64.5
~ 66.0 psi)
|
|
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
|
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
|
|
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.
|
|
|
5. |
Release the residual pressure in fuel line (Refer to “Release
Residual Pressure in Fuel Line”).
|
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.
|
|
|
6. |
Test End
|
(1) |
Remove the Special Service Tool (SST) from the fuel feed
tube and the high pressure fuel pump.
|
|
(2) |
Connect the fuel feed tube and the high pressure fuel
pump.
|
|
Fuel Pressure Test
|
1. |
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.
|
|
|
2. |
Install the Special Service Tool (SST).
|
(1) |
Disconnect the fuel feed tube from the high pressure fuel
pump.
|
There may be some residual pressure even after
“Release Residual Pressure in Fuel Line” work, 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 high pressure
fuel pump (Refer to the figure below).
|
|
|
3. |
Inspect fuel leakage on connections among the fuel feed tube,
the high pressure fuel pump, and the SST components with IG ON.
|
|
4. |
Measure Fuel Pressure.
|
(1) |
Start the engine and measure the fuel pressure at idle.
Fuel Pressure:
480 ~ 520 kPa (4.9 ~ 5.3 kgf/cm², 69.6
~ 75.4 psi)
|
|
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
|
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
|
|
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.
|
|
|
5. |
Release the residual pressure in fuel line (Refer to “Release
Residual Pressure in Fuel Line”).
|
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.
|
|
|
6. |
Test End
|
(1) |
Remove the Special Service Tool (SST) from the fuel feed
tube and the high pressure fuel pump.
|
|
(2) |
Connect the fuel feed tube and the high pressure fuel
pump.
|
|
Release Residual Pressure in Fuel Line
|
Whenever the high pressure fuel pump, 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. Release
the residual pressure in the high pressure fuel line by referring to
the "Residual fuel pressure release procedure" below before removing
any high pressure fuel system components..
|
|
Wear safety glasses and fuel resistant gloves.
|
|
1. |
Turn the ignition off and disconnect the battery negative cable.
|
|
2. |
Remove the fuel pump relay (A).
|
|
3. |
Disconnect the electrical connector from the high pressure fuel
pump.
|
|
4. |
Reconnect the battery negative cable.
|
|
5. |
Run the engine for about 20 seconds to lower the pressure in both
the high or low pressurelines. The engine may shut off within the 20
second period. If not, turn the engine off.
|
|
6. |
Proceed with the service or repair. Use rags to cover opening
and catch spills when opening up the high pressure system.
|
|
7. |
Reinstall / re-connect all components in reverse order of removal.
Start engine and confirm proper operation, and make sure there are no
fuel leaks.
|
|
8. |
After completing, clear DTC(s) using GDS scan tool (the procedure
described above will cause DTC to set).
|
Components Location
1. Fuel Tank
2. Fuel Pump
3. Fuel Filter
4. Fuel Pressure Regulator
5. Canister
6. Fuel Tank Air Filter
7. Fuel Tank Pressure Sensor ( ...
Removal
1.
Release the residual pressure in fuel line (Refer to “Release
Residual Pressure in Fuel Line” in this group).
2.
Remove the ...
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Fuel Fill Door. Repair procedures
Replacement
1.
Remove the fuel fill door cap (A).
2.
After loosening the mounting screws, then remove the fuel fill
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Hyundai Sonata: Repair procedures - Revised
Components and Components Location
Fuel Tank. Repair procedures