If a diesel stalls when decelerating, it may indicate a lubrication problem in the injector pump. The first thing that should be checked is the idle speed. If low, it could prevent the pump governor from recovering quickly enough during deceleration to prevent the engine from stalling.
Water in the fuel can also cause stalling by making the metering valve or plungers inside the pump stick. Use of a lubricating additive may help cure this condition. If an additive doesn’t help, the pump may have to be cleaned or replaced.
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