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 gage
- Inspect fuel pressure with normal idle status
Specification : 338~348 kPa (3.45~3.55 kg/cm2 )
- Is fuel pressure within the specified value?
YES
- Go to next step as below
NO
- Inspect the suspected area. Refer to table as below. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
CONDITION AND SUSPECTED AREA REFERENCECondition 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 for the following:
- Worn cylinder
- Worn valve
- Worn piston or piston ring
Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure
NO
Inspect the suspected area. Refer to table as below. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
CONDITION AND SUSPECTED AREA REFERENCECondition 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.