Hyundai i-30: Fuel Delivery System / Fuel pressure test

Hyundai i30 (PD) 2018-2024 Service Manual / Engine Control / Fuel System / Fuel Delivery System / Fuel pressure test

Fuel Pressure Test
1.
Release the residual pressure in fuel line.
(Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line")
  
When removing the fuel pump relay, the diagnostic trouble code (DTC) will be occurred. Therefore delete the code with the diagnostic tool after "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 :
330 - 370 kpa (3.37 - 3.77 kgf/cm², 47.9 - 53.7 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 open stuck
Fuel pump

(3)
Turn the ignition switch OFF.
5.
Release the residual pressure in fuel line.
(Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line")
  
When removing the fuel pump relay, the diagnostic trouble code (DTC) will be occurred. Therefore delete the code with the diagnostic tool after "Release residual pressure in fuel line" work.
6.
Test End
(1)
Remove the special service tool (SST) from the fuel feed tube ant the delivery pipe.
(2)
Connect the fuel feed tube and the delivery pipe.

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    Release residual pressure in fuel line

    Release Residual Pressure in Fuel Line    • 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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