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of the main tank system. They receive fuel from their respective main wing tank via gravity or
scavenge ejector pump flow. Fuel from the collector tanks is supplied to each engine-driven
pump unit by main ejector pumps or electric boost pumps.
Boost Pumps
Two DC electric boost pumps provide the engines with a standby fuel feed system. They are
available for engine starting, and as a backup fuel feed source if either main ejector pump
output pressure is too low to satisfactorily feed its respective engine. The left boost pump is
powered by the DC battery bus, and the right boost pump by DC bus 2. The boost pumps are
located downstream of their respective collector tanks, on the fuel feed lines to the
engine-driven pumps. During normal operation, the only pilot action required is to arm both
BOOST PUMP switches on the FUEL control panel prior to engine start, and disarm them after
shutdown.
When both BOOST PUMP switches are armed, the boost pumps are activated if low pressure is
sensed at either left or right main ejector pressure switch (this is the case prior to engine start).
If a single BOOST PUMP switch is armed, both boost pumps will be activated if low pressure is
sensed on the armed side’s main ejector pressure switch. For example, if only the left BOOST
PUMP switch is armed (pressed in), then both pumps will activate if low pressure is sensed at
the left main ejector output. The boost pumps can provide fuel to both engines fuel feed systems
through a crossover feed line.
If a boost pump has been activated, sufficient pump output pressure is indicated by the green
ON legend in the switch/light. Insufficient output pressure is indicated by the amber INOP
legend, and the L (R) FUEL PUMP caution EICAS message.
BOOST PUMP Switch/Lights
Figure 12−10−5
FUEL SYSTEM
Description
Vol. 2 12−10−5
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
FUEL DISTRIBUTION (CONT'D)
Engine-Driven Pump
The engine-driven pump supplies high-pressure fuel to the engine fuel control unit (FCU) for
combustion, and to the motive flow system to power the ejector pumps. The engine-driven pump
is located on the engine accessory gearbox, and operates whenever the engine core (N2) is
turning. For additional information, see Chapter 19, Power Plant.
Motive Flow
Motive flow is the continuous movement of fuel under pressure through the fuel feed lines.
Motive flow is generated by the engine-driven pump, and is sufficient to supply the engine with
its fuel intake needs through the on-side main ejector pump. If a blockage occurs within the feed
system, and motive flow fuel pressure drops (sensed at the main ejector pump pressure switch),
the electric boost pumps activate, and supply the engine with sufficient fuel for operation.
Ejector Pump Operation
Ejector pumps operate on the same principle as the venturi tube, and have no moving parts.
The high-pressure stream of fuel at the ejector’s motive flow nozzle induces a large volume of
fuel to flow into the intake of the ejector. The fuel then enters the feed lines and flows under
pressure.
FUEL SYSTEM
Description
Vol. 2 12−10−6
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
FUEL DISTRIBUTION (CONT'D)
Main Ejector and Ejector Operation
Figure 12−10−6
FUEL SYSTEM
Description
Vol. 2 12−10−7
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
FUEL DISTRIBUTION (CONT'D)
Main Ejector Pump
There are two main ejector pumps (left and right), located on top of their respective collector
tanks. They receive pressurized fuel from their on-side engine’s motive flow supply, and deliver
an uninterrupted fuel supply from the collector tank to the respective engine. In addition, the
main ejector provides the motive flow fuel supply to the on-side transfer ejector pump. Main
ejector motive flow fuel is prevented from feeding the cross-side engine by a one-way check
valve.
Scavenge Ejector Pump
The left and right scavenge ejector pumps are located at the lowest inboard point in each main
(wing) tank. The scavenge ejectors’ motive flow is created by the high-pressure fuel output of
the engine-driven pumps. The scavenge ejectors transfer fuel from the main tanks to the
collector tanks.
Transfer Ejector Pump
The left and right transfer ejector pumps are located at the lowest point of the center auxiliary
tank. Their motive flow supply is derived from their on-side main ejector pump output. The
transfer ejectors continuously transfer fuel to the main tanks, maintaining them filled to 93%
　
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