AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual - Manual (Page 316)

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© 2014 AEM Performance Electronics
Infinity User Manual
fuel system’s static pressure. The system’s static pressure is the amount of pressure measured
with the vacuum hose disconnected or with the engine turned off. The fuel system’s static
pressure is higher than the fuel pressure at idle or under high vacuum conditions.
When the engine is running, the engine vacuum acts against the spring and the effect of the
vacuum diminishes as the throttle is opened. At idle, there is a high amount of fuel returned to the
tank because the vacuum is pulling the diaphragm seat off of the fuel return orifice, reducing fuel
pressure. As the throttle is opened, the diaphragm seat starts to close off the orifice, restricting
the amount of fuel flow through the return line.
An adjustable regulator allows the static pressure to be raised or lowered via an adjusting screw
that acts on the diaphragm spring. On most adjustable regulators, when the screw is turned IN
pressure raises and when it is turned OUT pressure is reduced. Although we highly recommend
installing a proper fuel delivery system, raising or lowering fuel pressure can compensate for fuel
injectors that may not be properly sized for an application.
Most aftermarket fuel pressure regulators (and OEM regulators) use a 1:1 ratio of fuel to boost
pressure for increasing fuel pressure in applications where forced induction is used. This means
that for every psi of boost, fuel pressure is increased one psi. This ensures adequate fuel
delivery under boosted conditions.
For more information, go to Fuel Pressure
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