Kia Forte: Fuel Pressure Test
|
1. |
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 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:
323 ~ 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 the Fuel
Delivery System - Repair Procedures - "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.
|
|
[SULEV Type]
[LEV2 Type]
1. Fuel tank
2. Fuel pump
3. Fuel filter
4. Fuel pressure regulator
5. Canister
6. Fuel tank air filter
7. Fuel tank ...
There may be some residual pressure even after “Release Residual
Pressure in Fuel Line” work, so cover the hose connecti ...
Components Location
Release Residual Pressure in Fuel Line