Introduction
Procedure to prevent injector Plunger Spring failure due to inadequate fuel system priming.
- The low-pressure fuel system must be primed after injector replacement or other repair to the low-pressure fuel system circuit which may allow air to enter the system.
- Inadequate priming can result in air being present in the low-pressure fuel system and inside the injectors.
- Attempting to start the engine without adequate priming may result in an early hour failure of the injector plunger spring.
- Follow the procedure below to prevent injector failure due to inadequate priming.
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| NOTICE |
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| DO NOT START THE ENGINE WITHOUT PRIMING THE FUEL SYSTEM |
Illustration 1 g03735591
Damaged plunger spring due to improper fuel system priming
Fuel System Priming Procedure:
- Disconnect the injector harness at the valve cover.
- Use the hand primer to fill the fuel system. Pump until the hand primer becomes too hard to depress by hand.
- Crank the engine 3 times for 15 seconds each. Reapply the hand primer after each cranking cycle.
- Once the hand primer remains hard to depress after the 15 second crank, reconnect the injector harness and start the engine.
- Clear any related fault codes (ET) that were logged while cranking the engine with the injector harness disconnected.