Direct Fuel Injection
90-8M0050731 MAY 2011 Page 3B-49
Hose Clamp Tool Kit 91‑803146A04
Fuel Rail
Fuel Pressure Regulator
The fuel regulator is located on the port fuel rail.
The fuel pump can deliver pressure in excess of 689.5 kPa (100 psi). Fuel pressure inside the fuel rail must be at a specific higher
pressure over the air pressure or the PCM calibrations will be incorrect. The fuel pressure regulator maintains the higher pressure
over the air pressure in the fuel rail and allows the excess fuel to return into the vapor separator. The fuel pressure regulator
diaphragm is held closed with a spring that requires a specific pressure to force the diaphragm off the diaphragm seat. The backside
of the diaphragm is exposed to air rail pressure. As the air rail pressure increases, the fuel pressure needed to open the regulator
will equally increase.
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