The PT system relies on injectors to meter and inject the fuel into the cylinder with metering based on a pressure-time principle. The interval determines the time for metering that the metering orifice of the injector stays open.

This interval is ascertained and controlled by the engine speed, which determines the rate of camshaft rotation and consequently the injector plunger movement. Fuel pressure gets supplied by a gear-driven positive displacement fuel pump.

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