Kia Niro: Fuel Delivery System / Fuel pressure test (low pressure system)
| Fuel Pressure Test (Low
pressure system) |
| 1. |
Release the residual pressure in fuel line.
(Refer to the Fuel Delivery System - Inspection - "Release Residual Pressure
in Fuel Line").
|
When removing the fuel pump fuse, a Diagnostic Trouble Code (DTC)
may occur. Delete the code with the KDS/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 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 ignition "ON".
|
| 4. |
Measure the fuel pressure.
| (1) |
Start the engine and measure the fuel pressure at idle.
|
Fuel Pressure: Over 290 kPa (Over 2.9 bar, Over 2.95
kgf/cm², Over 42.06 psi)
|
|
If the fuel pressure does not satisfy the specification,
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 could 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) |
Switch "OFF" the ignition.
|
|
| 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 fuse, a Diagnostic Trouble Code (DTC)
may occur. Delete the code with the KDS/GDS after completion of
“Release Residual Pressure in Fuel Line” work.
|
|
| 6. |
Finish test.
| (1) |
Remove the Special Service Tool (SST) from the low pressure fuel
feed tube and the low pressure inlet of high pressure fuel pump.
|
| (2) |
Connect the low pressure fuel feed tube and the low pressure
inlet of high pressure fuel pump.
|
|
Components Location
[Fuel Tank Assembly]
1. Fuel Tank
2. Fuel Pump Assembly
3. Canister
4. Fuel Tank Air Filter
5. Fuel Tank Band
...
Release Residual Pressure
in Fuel Line
Whenever the high pressure fuel fuse, fuel pipe, delivery pipe, or injecto ...
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Components and components location
Release residual pressure in fuel line