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What are the symptoms of a faulty National III diesel fuel pump?

1 Answers

VonPhoebe

07/29/25 1:14pm

National III diesel fuel pump failure can lead to phenomena such as false overspeeding and the diesel engine failing to start. The details are as follows: False overspeeding phenomenon: False overspeeding refers to the diesel engine starting with normal idle speed, but not decelerating after accelerating and releasing the throttle. This occurs when the injector plunger is worn out, and the rack is set to idle fuel quantity at the idle position. Once the throttle is increased to raise speed and then released, the rack can return to the idle position, but the governor's moving parts and transmission components are stuck in the high-speed position due to excessive wear, preventing the speed from decreasing. If this phenomenon occurs, the fuel injection pump must be inspected and repaired. Diesel engine failing to start: If there is no fuel in the high-pressure fuel line but fuel is present in the low-pressure fuel circuit, and the diesel engine fails to start, it indicates that the fuel supply rack is stuck in the no-fuel supply position. In this case, the fuel injection pump also needs timely inspection and repair. Fluctuating speed: This is a sign that the fuel supply rack is not flexible, or the internal components of the governor are excessively worn, leading to increased clearance. Therefore, the fuel injection pump also needs to be inspected and repaired.

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