Fuel System Inspection
- Fuel Line Pressure Inspection
- Check the fuel for excessive water, alcohol, or other contaminants. Replace contaminated fuel as necessary.
- Install a fuel pressure gauge
- Inspect fuel pressure with normal idle status
Specification: 338~348kPa (3.45~3.55kg/cm2 )
- Is fuel pressure within the specified value?
YES
- Go to next step as below
NO
- Inspect the suspected area. Refer to table below. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Condition Possible Cause Suspected Area Fuel Pressure too low Clogged fuel filter Fuel filter Fuel leak on the fuel-pressure regulator that is assembled on fuel pump Fuel Pump (Fuel Pressure Regulator) Fuel Pressure too High Sticking fuel pressure regulator Fuel Pump (Fuel Pressure Regulator)
- Fuel Pressure Hold Inspection
- Stop the engine and check for a change in the fuel pressure gauge reading.
Specification: After engine stops, the gauge reading should hold for minimum 5 minutes
- Is fuel pressure within the specified value?
YES
- Visually/physically inspect the engine mechanical problem. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure
NO
- Inspect the leakage or malfunctioning of suspected area. Refer to table below. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Condition Possible Cause Suspected Area Fuel pressure drops slowly Injector leak Injector Fuel pressure drops immediately Stuck open in check valve of the fuel pump Fuel pump
- Stop the engine and check for a change in the fuel pressure gauge reading.