The fuel heater is located inside the fuel filter housing, under the filter.
The fuel pressure regulator is located in the side of the filter housing, held on by 2 torx screws.
Fuel pressure in the cylinder head fuel galleries is maintained at 310-448 kPa (45-65 psi) by a Fuel Pressure Regulator. The Fuel Pressure Regulator consists of a spring-loaded poppet valve, which opens to allow excess fuel to exit fuel filter/water separator prior to being cycled through the fuel filter. Fuel exiting the fuel filter/water separator is returned to the fuel tank.