Delivery Valve

As plunger pressure becomes high enough to force fuel into delivery valve, valve opens and fuel is delivered to the injector nozzle. A spring maintains closing pressure in the valve. When correct amount of fuel has been delivered, spring pressure closes valve.

A piston in the bottom of the delivery valve, instantly restricts fuel passage through valve. This prevents fuel seepage at the injector and maintains better fuel control. Delivery valve is located directly above the plunger assembly inside the pump housing. Fuel line to injector nozzle is attached above the delivery valve.