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 delivery
pipe.
|
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 fuel
delivery pipe (Refer to the figure below).
|
|
|
3. |
Inspect fuel leakage on connections among the fuel
feed tube, the delivery pipe, and the SST components with IG ON.
|
|
4. |
Measure Fuel Pressure.
|
(1) |
Start the engine and measure the fuel pressure
at idle.
Fuel Pressure:
429 ~ 469 kPa (4.38 ~ 4.79 kgf/cm²,
62.3 ~ 68.1 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 valve 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”).
|
|
6. |
Test End
|
(1) |
Remove the Special Service Tool (SST) from
the fuel feed tube and the delivery pipe.
|
|
(2) |
Connect the fuel feed tube and the delivery
pipe.
|
|
Components Location
1. Fuel Tank
2. Fuel Pump
3. Fuel Filter
4. Fuel Pressure Regulator
5. Canister
6. Fuel Tank Band
7. Fuel Filler Hose
8. Ventilatio ...
Whenever the high pressure fuel pump, fuel pipe,
delivery pipe, or injector is removed immediately after shutting off
the ...
Hyundai Accent: Repair procedures
Components and Components
Location
Release Residual Pressure in Fuel Line