This is the most fundamental question. "PT" is an acronym that describes the core operating principle of the pump.
P stands for Pressure.
T stands for Time.
It refers to the fact that the amount of fuel injected into the cylinder is a function of the Pressure from the pump and the Time available for the fuel to flow into the injector. The pump generates fuel pressure, which is supplied to the injectors. The injectors are cam-driven, and the time their intake port remains open (controlled by engine RPM) determines the exact quantity of fuel that enters before injection. In simple terms: higher pump pressure + more time = more fuel.
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