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: 338~348kPa (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 as below. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
PROBLEM SYMPTOMSCondition 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
- 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.
PROBLEM SYMPTOMSCondition Possible Cause Suspected Area Fuel pressure drops slowly Injector leak Injector Fuel pressure drops immediately Stuck open check valve of the fuel pump Fuel pump