Kia Rio: Fuel Pressure Test (Low pressure system)
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1. |
Release the residual pressure in fuel line (Refer to the Fuel
Delivery System - Repair Procedures - "Release Residual Pressure in
Fuel Line").
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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.
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2. |
Install the Special Service Tool (SST).
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(1) |
Disconnect the low pressure fuel feed tube from the low
pressure inlet of high pressure fuel pump.
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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.
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(2) |
Install the special service tool for measuring the fuel
pressure in between the low fuel feed tube and the low pressure
inlet of high pressure fuel pump (Refer to the figure below).
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3. |
Inspect fuel leakage on connections among the low fuel feed tube,
the low pressure inlet of high pressure fuel pump, and the SST components
with IG ON.
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4. |
Measure Fuel Pressure.
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(1) |
Start the engine and measure the fuel pressure at idle.
Fuel Pressure:
429 ~ 469 kPa (4.38 ~ 4.79 kgf/cm², 62.3 ~ 68.1
psi)
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If the fuel pressure differs from the standard
value, repair or replace the related part (Refer to
the table below).
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Fuel
Pressure
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Cause
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Related Part
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Too Low
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Fuel filter clogged
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Fuel Filter
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Fuel leakage
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Fuel Pressure Regulator
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Too High
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Fuel pressure regulator valve stuck
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Fuel Pressure Regulator
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(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
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If the gauge reading should not be held, repair
or replace the related part (Refer to the table below).
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Fuel Pressure
(After Engine Stops)
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Cause
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Related
Part
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Fuel Pressure Drops Slowly
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Leakage on injector
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Injector
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Fuel Pressure Drops Immediately
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Check valve of fuel pump stuck open
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Fuel Pump
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(3) |
Turn the ignition switch OFF.
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5. |
Release the residual pressure in fuel line (Refer to the Fuel
Delivery System - Repair Procedures - "Release Residual Pressure in
Fuel Line").
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6. |
Test End
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(1) |
Remove the Special Service Tool (SST) from the low pressure
fuel feed tube and the low pressure inlet of high pressure fuel
pump.
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(2) |
Connect the low pressure fuel feed tube and the low pressure
inlet of high pressure fuel pump.
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1. Fuel Tank
2. Fuel Pump
3. Fuel Filter
4. Fuel Pressure Regulator
5. Canister
6. Fuel Tank Band
7. Fuel Filler Hose
8. Ventilation Hose
9. Vapor Tube
10 ...
Whenever the high pressure fuel pump, fuel pipe, delivery pipe,
or injector is removed immediately after shutting off th ...
Components Location
Release Residual Pressure in Fuel Line