Pump Overflow Restriction

 
By 28 March 2017
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The overflow restriction  is screwed into the injection pump’s governor cover and connected to the pump’s interior. It permits a variable amount of fuel to return to the fuel tank through a narrow passage. For this fuel, the restriction represents a flow resistance that assists in maintaining the pressure inside the injection pump. Being as inside the pump a precisely defined pressure is required as a function of pump speed, the overflow restriction and the flow-control valve are precisely matched to each other.