Overview of fuel delivery system
Fuel Pump: The purpose is to pump fuel from the tank or catch tank
and pressurize the fuel rail
Fuel Rail: The hardware connection that feed the injectors with
pressurized fuel
FPR (Fuel Pressure Regulator): FPR controls the fuel pressure by
controlling backflow. The FPR is often adjustable to set the base
pressure.
A hose from the manifold is connected to the FPR with purpose to
increase or decrease the fuel pressure when manifold air pressure
changes. The most common is to increase the pressure in a linear
relationship
Injector: Injectors supply the engine with fuel by injecting fuel in the
inlet port. The injectors are electrically controlled by NIRA i7x.
2.4.1 Why use a Fuel Pressure Regulator with MAP Feedback
As described above, the fuel pressure is increased with raised manifold air
pressure. The reason for this is to keep the same pressure balance over the
injector.
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