13. Bleed The High Pressure Fuel System Test - Low Pressure Fuel System Validated
13. BLEED THE HIGH PRESSURE FUEL SYSTEM TEST - LOW PRESSURE FUEL SYSTEM VALIDATEDPurpose:
Bleed the high pressure fuel system after validating the low pressure fuel system is providing the fuel volume and flow required by the high pressure fuel system.
Bleed The High Pressure Fuel System Test - Low Pressure Fuel System Validated
- Bleed the high pressure fuel system. Refer to the Fuel Delivery and Air Induction, Fuel System, Fuel System Bleeding - High Pressure, Diesel Engine.
- If the fuel is aerated after completing the fuel system bleeding procedure, carry out the Combustion Gas In The Fuel Rail Test to continue diagnosis. 14. Combustion Gas In The Fuel Rail Test
Recommended Procedure:
Bleed the high pressure fuel system. Refer to the Fuel Delivery and Air Induction, Fuel System, Fuel System Bleeding - High Pressure, Diesel Engine.
If the vehicle does not start, the fuel stays aerated and the correct fuel flow and volume in the low pressure fuel system has been validated, check the secondary fuel filter. Repair as necessary. If the fuel continues to stay aerated, carry out the Combustion Gas In The Fuel Rail Test to continue diagnosis. 14. Combustion Gas In The Fuel Rail Test
If the vehicle starts, the fuel stays aerated and does not stall after the bleed tool is removed, carry out the High Pressure Fuel System Test to continue diagnosis. If the vehicle stalls during the High Pressure Fuel System Test, carry out the Combustion Gas In The Fuel Rail Test to continue diagnosis. 25. High Pressure Fuel System Test 14. Combustion Gas In The Fuel Rail Test
If the vehicle still has a hard start or no start condition and the fuel is not aerated, carry out the Check Vehicle Power During Cranking Test to continue diagnosis. 15. Check Vehicle Power (VPWR) During Cranking Test
Tools Required:
Scan tool