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What are the symptoms of a faulty high-pressure fuel pump in the Magotan?

1 Answers

DiLily

07/30/25 2:57am

High-pressure fuel pump failure conditions: 1. Inability to reduce speed: Pseudo-runaway refers to the diesel engine starting with normal idle speed, but failing to decelerate after releasing the throttle when accelerated to high speed. This occurs when the injector plunger wears out, causing the fuel rack to remain at the idle fuel quantity position. Once the throttle is released after acceleration, the fuel rack can return to the idle position, but the governor's moving parts and transmission components, due to excessive wear, get stuck in the high-speed position, preventing speed reduction. If this phenomenon occurs, the fuel injection pump must be inspected and repaired. 2. Fuel rack stuck in the no-fuel position: If no fuel comes out of the high-pressure fuel line, but there is fuel in the low-pressure circuit, and the diesel engine fails to start, it indicates that the fuel rack is stuck in the no-fuel position. In this case, the fuel injection pump also needs immediate inspection and repair. 3. Fluctuating speed: This is a sign that the fuel rack is not moving smoothly or that the internal components of the governor are excessively worn, leading to increased clearance. Therefore, the fuel injection pump also requires inspection and repair.

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