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Measuring only injector pulse width, in a system with a fuel pressure regulator that is typically vacuum controlled will not give you the required accuracy of the amount of fuel delivered.
In more modern systems, fuel pressure is regulated by controlling the voltage to the pump itself (Ford) but still receives input from the fuel pressure sensor, without vacuum control of the pressure used with earlier systems with a fuel return line from the pressure regulator back to the tank.
The Ford system had no return line.
regards
mech
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