From the King Demon Manual:
Fuel Pressure
Most gasoline powered race engines usually
require between 6 and 7 1/2 PSI fuel pressure.
Gasoline carburetors can be run either at idle or
wide open throttle at these pressures. Alcohol
carburetors usually run best with idle pressures
between 4 and 6 PSI, with full throttle pressures
between 9 and 11 PSI. Be sure your fuel
delivery system is properly adjusted and able to
maintain volume flow at these pressures. Improperly
adjusted or inadequate fuel delivery
will result in poor performance and possible
engine damage.
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