24. High Pressure Fuel Injection Pump Leak Test

24. HIGH PRESSURE FUEL INJECTION PUMP LEAK TEST

Purpose:
The purpose of this test is to determine if the high pressure fuel injection pump is leaking.

High Pressure Fuel Injection Pump Leak Test
- Carry out the High Pressure Fuel Injection Pump Leak Test.







Recommended Procedure:

NOTICE: Do not start the engine Damage to the engine may occur.

- Ignition in the OFF position.
- Drain the engine oil. Do not install the oil drain plug.
- Install a battery charger to maintain battery voltage during this test.
- Turn the ignition to the ON position. Allow the low pressure fuel pump to run until it stops.
- Cycle the ignition to the OFF position then to the ON position after the low pressure pump stops. Repeat this step 10 times.
- Visually check for fuel leaking during this test. Fuel drains from the oil drain plug hole if the high pressure fuel injection pump is leaking.
- If visible fuel leaks are present, install a new high pressure fuel injection pump. Refer to the Fuel Delivery and Air Induction, Fuel Charging and Controls, Fuel Injection Pump High Pressure. Check the intake air system and related components for engine oil residue caused from the engine oil overfull condition and repair as necessary. Check the turbocharger bearings. Refer to the Fuel Delivery and Air Induction, Turbocharger, Bearing Clearance Check. Clear the fuel injector adaptive tables using the scan tool.
- If no visible fuel leaks are present and the engine oil level was overfull in the Check Engine Oil Level test, install the oil drain pan plug and fill the engine with 14.19 liters (15 quarts) of the correct engine oil.
- For a no start condition, carry out the Glow Plug Mist Test - No Start to continue diagnosis. 18. Glow Plug Mist Test - No Start
- For a hard start condition, carry out the Power Balance Test to continue diagnosis. 21. Power Balance Test

Possible Causes:
- High pressure fuel injection pump
- Fuel pressure control valve
- Fuel volume control valve
- High pressure fuel system leak

Tools Required:
Scan tool