KIA Niro: Fuel Pressure Test (Low pressuresystem)
- Release the residual pressure in fuel line.
(Refer to the Fuel Delivery System - Inspection - "Release Residual Pressure in Fuel Line").
Warning
When removing the fuel pump fuse, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the KDS after completion of "Release Residual Pressure in Fuel Line" work.
- Install the Special Service Tool (SST).
(1) Disconnect the fuel feed tube from the delivery pipe.
Warning
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).
For 09353-02100
For 0K353-D4100
- Inspect fuel leakage on connections among the fuel feed tube, the delivery pipe, and the SST components with ignition "ON".
- 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)
Warning
If the fuel pressure does not satisfy the specification, repair or replace the related part. (Refer to the table below.)
(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
Warning
If the gauge reading could not be held, repair or replace the related part. (Refer to the table below.)
(3) Switch "OFF" the ignition.
- Release the residual pressure in fuel line.
(Refer to the Fuel Delivery System - Repair Procedures - "Release Residual Pressure in Fuel Line").
Warning
When removing the fuel pump fuse, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the KDS after completion of "Release Residual Pressure in Fuel Line" work.
- 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.
READ NEXT:
Release Residual Pressure in Fuel Line | Fuel Tank Repair procedures
Warning
Whenever the high pressure fuel fuse, fuel pipe, delivery pipe, or injector is removed immediately after shutting off the engine, an injury may be caused by the release of highly pressurized fuel.
Release the residual pressure in the
Fuel Pump Repair procedures
Fuel sender
Turn the ignition switch OFF, and then remove battery (-) terminal.
Remove the fuel pump assembly.
Using an ohmmeter, measure the resistance between terminals 1 and 6 of
sender connector (A) at
each float level.
SEE MORE:
Piston and Connecting Rod Repair procedures
Disassembly
Warning
Be sure to read and follow the "General Safety Information and
Caution" before doing any work related
with the high voltage system. Failure to follow the safety instructions may
result in serious electrical
injuries
Main High/ Sub High Voltage Battery
Main High Voltage Battery
Component Location
Power Relay Assembly (PRA)
Cell Monitoring Unit (CMU)
Battery Temperature Sensor
Runaway Arresting Device (RAD)
Warning
Main Relays (Positive, Negative), Pre-Charge Relay, Pre-Charge
R
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