Oberating Instructions; Before Starting - Continental Motors GTSIO-520 SERIES Operator's Manual

An auxiliary fuel tank pump forces fuel to the fuel injection pump,
where solid fuel and vapor are separated by swirling action. Vapor is
returned to the fuel tank. The fuel injector pump forces solid fuel
into the fuel-air mixture control assembly.
The fuel-air mixture control assembly controls the amount of intake
air admitted into the intake manifold, and meters the proportionate
amount of fuel to the manifold valve. Integral with this assembly is a
variable pressure controller cam operated through the throttle
linkage, to control turbocharger compressor discharge pressure
between 31.5" (Hg.) and 42.5" (Hg.), depending on cam positioning.
In addition to the variable controller the assembly has three control
units; one for air in the air throttle body and two for the fuel-air
control unit.
a. The air throttle assembly includes a butterfly valve which
controls the amount of air entering the intake manifold. This valve is
controlled by a lever which is connected to the aircraft throttle
control.
b. The fuel control assembly contains a metering valve and a
mixture control valve. The metering valve is linked to the air throttle
valve lever. The mixture control valve is linked to the cockpit
mi'xture control. The fuel control also by-passes excess fuel back to
the fuel injector pump inlet port.
The fuel manifold valve contains a diaphragm chamber and necessary
outlet ports which connect to the fuel injector lines. The
spring-loaded diaphragm works with a ported plunger which
distributes the precise amount of fuel, through the fuel injector lines,
to the fuel injector nozzles in the cylinders.
OPERATING INSTRUCTIONS
1. BEFORE STARTING
a. Perform the daily inspection, page 30.
b. Make sure that mixture control is in "IDLE CUT-OFF"
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