Fuel System Inspection: Notes
- 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
NO : --> Inspect the suspected area. Refer to table as below. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
CONDITION CHARTCondition 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 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 CHARTCondition 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.