Overflow Restriction

Fig. 5 Overflow Restriction:

The overflow restriction, Fig. 5, is screwed into the governor cover of the VE distributor pump and communications with the pump cavity. It allows a variable quantity of fuel to return to the fuel tank through a small (0.6 mm/0.023 in) bore. For the overflow fuel, this restriction offers a flow resistance that assists in maintaining fuel pressure in the cavity. Because precisely defined pressure is required in the cavity, the overflow restriction and pressure-control valve are designed as a component pair and are precisely matched to each other.