|
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:
324 ~ 363 kPa (3.3 ~ 3.7 kgf/cm², 46.9
~ 52.6 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”).
|
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 delivery pipe.
|
|
(2) |
Connect the fuel feed tube and the delivery pipe.
|
|
There may be some residual pressure even after “Release Residual
Pressure in Fuel Line” work, so cover the hose connection ...
Hyundai Elantra MD/UD: Fuel Pressure Test
