Kia Optima: Engine Control / Fuel System / Fuel Delivery System
Fuel pressure test
| 1. |
Release the residual pressure in fuel line.
(Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line")
|
When removing the fuel pump relay, a Diagnostic Trouble Code
(DTC) may occur. Delete the code with the KDS after completion of
“Release Residual Pressure in Fuel Line” work.
|
|
| 2. |
Install the Special Service Tool (SST).
| (1) |
Separate the fuel feed tube quick-connector (A).
|
• |
Open the clamp cover before disconnecting the
quick-connector.
|
|
• |
Separate the quick-connector after pressing the
clip (A) certainly using the clip removing tool.
|
|
• |
Damaged clip can result in fuel line leakage
due to bad connection.
|
|
• |
There may be some residual pressure even after
completing “Release Residual Pressure in Fuel Line”,
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:
330 - 370 kPa (3.36 - 3.77 kgf/cm², 47.8 - 53.6 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 Fuel Delivery System - "Release Residual Pressure in Fuel Line")
|
When removing the fuel pump relay, a Diagnostic Trouble Code
(DTC) may occur. Delete the code with the KDS after completion of
“Release Residual Pressure in Fuel Line” work.
|
|
| 6. |
Remove the SSTs from the fuel feed tube and the delivery pipe.
|
| 7. |
Install the fuel feed tube from the delivery pipe.
|
Release residual pressure in fuel line
| Release Residual Pressure
in Fuel Line |
|
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.
|
| 1. |
After disconnecting the negative battery terminal, remove the fuel pump
fuse (A).
|
| 2. |
Connect the negative battery terminal.
|
| 3. |
After starting the engine and let idle, turn the ignition switch OFF
after the engine has stopped on its own.
|
| 4. |
Install the fuel pump after disconnecting the battery negative (-) terminal,
install the fuel pump fuse.
|
| 5. |
Delete the Diagnostic Trouble Code (DTC) related the fuel pump fuse with
the KDS.
|
Description and operation
Description
•
The Variable Charge Motion Actuator (VCMA) is installed on the inlet
of the intake manifold.
•
It ...
Specifications
Specifications
Item
Specification
Fuel Tank
Capacity
60 ℓ (15.8 U.S.gal., 63.4 U.S.qt., 52.8 lmp.qt.) ...
Other information:
If the stop and tail lamp (LED) does not operate, have the vehicle checked by
an authorized Kia dealer.
The LED lamp cannot be replaced as a single component because it is an integrated
unit. The LED lamp has to be replaced with the unit.
A skilled technician should check or repair stop an ...
The child safety lock is provided to help prevent children from accidentally
opening the rear doors from inside the vehicle. The rear door safety locks should
be used whenever children are in the vehicle.
1. Open the rear door.
2. Turn the child safety lock (1) located on the rear edge of th ...
Variable Charge Motion Actuator (VCMA)
Fuel Tank