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D2 Fuel Pressure
Regulator provides precise consistent boost as much as twice the factory fuel
flow. From your
dedicate engine tuning, the FPR can boost from 20PSI to 85PSI, or as much as
your fuel pump can sustained.
Fuel Pressure Regulator background:
A key component of the
system is the fuel pressure regulator, which works with the fuel pump to
maintain a steady pressure relationship between the fuel line side of the
injectors and the intake manifold. It is mounted to the fuel rail (fuel
manifold).
Since the fuel is metered
by the ECU by altering the amount of time the injector is held open, the
volume of fuel injected would vary if there was a pressure difference between
fuel supply and the intake manifold under different conditions. When there is
a high vacuum in the intake manifold, such as at high rpm, the pressure in
the fuel system must be reduced. When there is low pressure in the intake
manifold, such as at low speed or full throttle operation, the pressure in
the fuel line must be increased.
The essential requirement is that the pressure differential remains the same
under all circumstances, so that only the time the injector is open
determines the amount of fuel injected. In order to maintain desired fuel
pressure, excess fuel is returned to the tank by a separate line from the
pressure regulator.
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