Fuel Pressure: Testing and Inspection

Fuel Pressure Test

1. Release the residual pressure in fuel line .

CAUTION:
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.

2. Install the Special Service Tool (SST).
(1) Disconnect the fuel feed tube from the high pressure fuel pump.

CAUTION:
There may be some residual high pressure even after "Release Residual Pressure in Fuel Line" work, so must cover the high pressure line connection part with a shop towel or a cloth to prevent residual fuel from spilling out before removing any high pressure fuel part. Then release pressure by carefully removing connection part. If not, it may result in the injury by high temperature and pressure fuel.

(2) Install the special service tool for measuring the fuel pressure in between the fuel feed tube and the high pressure fuel pump .




3. Inspect fuel leakage on connections among the fuel feed tube, the high pressure fuel pump, and the SST components with IG ON.
4. Measure Fuel Pressure.
(1) Start the engine and measure the fuel pressure at idle.

Fuel Pressure:480 - 519 kPa (4.9 - 5.3 kgf/cm2, 69.6 - 75.3 psi)

NOTE:
If the fuel pressure differs from the standard value, repair or replace the related part .





(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

NOTE:
If the gauge reading should not be held, repair or replace the related part .





(3) Turn the ignition switch OFF.
5. Release the residual pressure in fuel line .

CAUTION:
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.

6. Test End
(1) Remove the Special Service Tool (SST) from the fuel feed tube and the high pressure fuel pump.
(2) Connect the fuel feed tube and the high pressure fuel pump.