PRINCIPLES OF OPERATION
Fuel System
The Generator Fuel System provides filtered and pressurized diesel fuel to the diesel
engine. It consists of a fuel tank with removable fuel fill strainer, fuel lines, fuel filter, fuel
injection pump, and a fuel injector.
The diesel fuel is stored in a fuel tank. The tank features a plastic mesh strainer in the
fill neck opening and a fuel tank drain valve. The fuel tank supplies fuel via a flexible
tube to the fuel filter. The fuel filter removes impurities and water from the diesel fuel
before it reaches the diesel engine. The fuel filter is made up of a clear bowl and filter
head with a throw-away paper filter. The fuel filter also includes a fuel shutoff valve and
some version include bleed screws for removing air trapped in the fuel system. Another
flexible tube connects the fuel filter and the fuel injection pump (part of the diesel
engine).
With the engine cranking or running, the fuel flow is controlled by a mechanical
governor (part of the diesel engine) and the fuel injection pump. The fuel injection pump
pressurizes the fuel and transfers it to the fuel injector. Fuel is sprayed by the injector
into the engine combustion chamber where it is mixed with air and ignited. (
This video
explains how it works
) The fuel that is not burned by the engine is returned to the
generator set fuel tank via an excess fuel return line on the fuel injector. The returning
fuel is used to lubricate the injector and keep it cool. Any derbies in the fuel system may
cause the fuel injector to stick open or not close completely. This dripping of fuel will
result in poor combustion and engine operation.
The diesel engine is shutdown by the operator depressing the engine STOP lever which
places the fuel injection pump control rack in the no fuel position. Stop the fuel and you
stop the engine. For models that can be shut off by an electric switch, an electric
solenoid pulls a cable that releases the same RUN/STOP lever. The drawbacks are
that you have to reset this RUN/STOP lever back to the run position the next time you
want to use the generator.
Alternatively some models use an electric fuel switch to stop the fuel from reaching the
fuel pump. The switch is an electric magnet that pulls open a spring loaded plunger
with rubber stopper at the end of it. When open, the engine can run normally. When
closed it starves it of fuel causing it to shut down.
Low oil pressure detected or the engine starter switch turned to the off position can
trigger either one of these devices to shut down the engine starving it of fuel.
Some fuels can damage the rubber fuel stopper inside the electric fuel switch causing it
to stick and not open. Overheating or intermittent electrical connection may cause the
electric magnet release or fail resulting in a engine that will not start or is starved of
enough fuel that under load it fails to run correctly. This electric fuel switch is only
AGI6500DE & AGI6500SDE Operator / Owners Manual Version 11.4.1
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Summary of Contents for AGI6500DE
Page 1: ...Aurora Portable Generator Operation Manual Models AGI6500DE AGI6500SDE ...
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Page 43: ...AGI6500SDE Schematics AGI6500DE AGI6500SDE Operator Owners Manual Version 11 4 1 Page 43 ...
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