![]() ![]() ![]() 5-7) that is controlled by the accelerator pedal and the centrifugal governor. The amount of fuel delivered per plunger stroke is determined by the regulating valve (upper right in Fig. Fuel that slips by the plungers returns to the filter. ![]() Fuel passes through the port for injection. As the rotor continues to turn, the inlet port is blanked off by the rotor body and one of the outlet ports is uncovered.Īs the outlet port is uncovered, the internal cam, acting through rollers, forces the plungers together. During the inlet stroke the plungers move outward under pressure from fuel entering through the inlet (or metering) port. Surplus fuel returns to the tank through low-pressure lines.Ī pair of cam-driven plungers, mounted on the pump rotor and turning with it, generate injector pressure (Fig. As explained below, the regulating valve throttles the injection pump during low-speed operation. Fuel then passes to the transfer pump and, from there, to the inlet side of the distributor pump for pressurization and injection. The engine-driven feed pump moves fuel from the tank to the filter and regulating valve. Figure 5-7 illustrates a CAV system for medium trucks. ![]()
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