Holley 550-811, Руководство по установке, Страница: 8 / 24

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All of the fittings on the intake manifold are -6 AN fittings (except the internal threads of the fuel pressure regulator which have a
“Saginaw” thread. There are barbed adapters included that can be installed on the inlet and return fittings that can be used to
connect to high pressure rated rubber fuel hose.
10.2 Fuel Pressure Regulator
The function of the fuel pressure regulator is to provide constant fuel pressure for the fuel injectors. Constant fuel pressure is
essential to ensure an accurate fuel metering process. The fuel pressure regulator of the system is set to 300kPa (43.5 psi) to
match the flow characteristics of the fuel injectors. The pressure regulator is reference to the manifold pressure to ensure the
required differential pressure for the metering event. Thus at high manifold vacuum (i.e. idle) the fuel pressure gage will read a
fuel pressure that is slightly lower than 300kPa (43.5 psi) because the gage is referenced to atmospheric conditions and not to
the intake conditions. The pressure reading at idle will vary with the application as manifold vacuum changes from engine to
engine and from application to application.
The regulator included is adjustable. To adjust the fuel pressure: remove the vacuum reference line and turn the screw
clockwise to increase the pressure (or counter-clockwise to decrease the fuel). Fuel pressure can be lowered slightly or raised
to reduce or increase the amount of fuel the injectors add. This is usually only done when the injectors used need to have their
flow decreased at idle or increased at wide-open throttle. Make sure you input the actual pressure into the software in the
“Engine Parameters” section.
NOTE: Increasing the fuel pressure by 10 PSI (43.5 to 53.5) results in a fuel metering increase of about 10%. The same is
true when reducing the fuel pressure.
NOTE:
If the fuel pressure is changed, make sure to change the “Actual System Pressure” in the Engine Parameters setup in
the software.
DANGER ! INCREASING THE FUEL PRESSURE BEYOND THE OPERATING POINT OF THE FUEL PUMP MAY RESULT
IN POOR ENGINE PERFORMANCE AND COULD CAUSE FUEL LEAKAGE ON COMPONENTS THAT ARE
NOT RATED FOR EXCESSIVE HIGH FUEL PRESSURES. LEAKAGE OR BURSTING OF FUEL SYSTEM
COMPONENTS MAY RESULT IN A FIRE OR EXPLOSION HAZARD, WHICH COULD CAUSE SERIOUS
INJURY OR DEATH.
Figure 3