Hyundai Veloster Manuals

Hyundai Veloster: Repair procedures - Fuel Delivery System - Fuel SystemHyundai Veloster: Repair procedures

Fuel Pressure Test

Release the residual pressure in fuel line (Refer to “Release Residual Pressure in Fuel Line” in this group).
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.
Install the Special Service Tool (SST).
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.
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).

Inspect fuel leakage on connections among the fuel feed tube, the delivery pipe, and the SST components with IG ON.
Measure Fuel Pressure.
Start the engine and measure the fuel pressure at idle.

Fuel Pressure:
480 ~ 500 kPa (4.9 ~ 5.1 kgf/cm², 69.6 ~ 72.5 psi)

If the fuel pressure differs from the standard value, repair or replace the related part (Refer to the table below).
Related Part
Too Low
Fuel filter clogged
Fuel Filter
Fuel leakage
Fuel Pressure Regulator
Too High
Fuel pressure regulator valve stuck
Fuel Pressure Regulator

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)
Fuel Pressure Drops Slowly
Leakage on injector
Fuel Pressure Drops Immediately
Check valve of fuel pump stuck open
Fuel Pump

Turn the ignition switch OFF.
Release the residual pressure in fuel line (Refer to “Release Residual Pressure in Fuel Line”).
Test End
Remove the Special Service Tool (SST) from the fuel feed tube and the delivery pipe.
Connect the fuel feed tube and the delivery pipe.

Release Residual Pressure in Fuel Line

Whenever the high pressure fuel pump, 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 high pressure fuel line by referring to the "Residual fuel pressure release procedure" below before removing any high pressure fuel system components.
Wear safety glasses and fuel resistant gloves.
Turn the ignition off and disconnect the battery negative cable.
Remove the fuel pump relay (A).

Disconnect the electrical connector from the high pressure fuel pump.
Reconnect the battery negative cable.
Run the engine for about 20 seconds to lower the pressure in both the high or low pressurelines. The engine may shut off within the 20 second period. If not, turn the engine off.
Proceed with the service or repair. Use rags to cover opening and catch spills when opening up the high pressure system.
Reinstall / re-connect all components in reverse order of removal. Start engine and confirm proper operation, and make sure there are no fuel leaks.
After completing, clear DTC(s) using GDS scan tool (the procedure described above will cause DTC to set).

Components and Components Location
Components Location 1. Fuel Tank 2. Fuel Pump 3. Fuel Filter 4. Fuel Pressure Regulator 5. Canister 6. Fuel Tank Band 7. Fuel Filler Hose 8. Ventilatio ...

Fuel Tank. Repair procedures
Removal 1. Release the residual pressure in fuel line (Refer to “Release Residual Pressure in Fuel Line” in this group). 2. Remove the ...

See also:

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