Grand Cherokee owners have recently reported issues with fuel economy after having the Z46 fuel pump recall serviced. If you’ve experienced worsening fuel efficiency post-repair, it’s crucial to understand what might be going wrong and how to correct it. This article explores the technical details surrounding the Z46 fuel pump recall and offers guidance to ensure your vehicle runs optimally.
The Z46 Fuel Pump Recall
The Z46 fuel pump recall specifically targets the high-pressure fuel pump in the Jeep Grand Cherokee equipped with a diesel engine. This fuel pump replacement is essential for preventing potential failures that can impact vehicle performance.
Despite the positive intent behind the recall, many owners have discovered a notable decrease in fuel economy after installation. This situation can lead to frustration and confusion among drivers who expect enhanced performance after such repairs.
The Importance of Correct Installation
The key issue revolves around the proper installation of the high-pressure fuel pump. Here are the essential steps to ensure the pump is installed correctly:
Aligning the Engine
To correctly time the Ecodiesel high-pressure fuel pump, start by setting the engine to 60 degrees ATDC (After Top Dead Center). This should be confirmed using the timing mark on the balancer, the position of the camshaft sensor reluctor wheel, and the crankshaft locking tool inserted into the block below the starter. Once the engine is positioned correctly, align the hole in the pump shaft with the fuel quantity solenoid, which will serve as the 0-degree reference point. After this, turn the pump counter clockwise 65 degrees, completing the timing process.
If this alignment is not achieved during installation, the vehicle will still run but may exhibit poor fuel economy. This is often because the pump operates outside its designed parameters.
Common Symptoms of Improper Installation
Improperly installed fuel pumps can manifest various symptoms, including:
- Decreased fuel efficiency
- Rough idling
- Increased emissions
- Reduced overall vehicle performance
If you notice any of these symptoms after a recall service, it’s essential to revisit the dealership that performed the installation.
