Check fuel pressure

NOTE:

Be cautious that Fuel is explosive and an empty fuel tank can still contain explosive gases. When working on fuel system make sure to supply adequate ventilation to the work area. Do not smoke, and keep sparks and open flames away.
The fuel system remains under pressure when the engine is not running. Release fuel system pressure before disconnecting any fuel line to reduce the chance of personal injury or fire damage to vehicle components.

Start-up the engine and remove the fuel pump fuse and wait until engine stops.
Install the fuel pressure gauge to the delivery pipe with the fuel pressure gauge adaptor.
Install the fuel pump fuse and start-up the engine.
Check that there is no fuel leakage from the pressure gauge or connection part.
Measure the fuel pressure at idle.
Specification: 480.5 ~ 500.1 kPa (4.9 ~ 5.1 kg/cm² , 84.3 ~ 87.2 psi)
Is the measured fuel pressure within specifications?
YES
- Go to "COMPONENT INSPECTION " procedure.
NO
- Repair or replace according to the below table. And then, go to "VERIFICATION OF REPAIR " procedure.

Condition	Possible Cause
Fuel Pressure is too low	Fuel filter, Fuel pump, Fuel pipe
Fuel Pressure is too high	Fuel pump, Fuel pipe