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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
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
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
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FUEL DISTRIBUTION (CONT'D)
Main Ejector and Ejector Operation
Figure 12−10−6
FUEL SYSTEM
Description
Vol. 2 12−10−7
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
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 the
preset limit. A float valve, located in the forward area of each main tank, prevents this transfer
until main tank fuel quantity is at or below the preset limit.
Engine Fuel Shutoff Valves
One electrically controlled engine fuel shutoff valve (“firewall” SOV) is installed on each engine
fuel feed line, ahead of the engine-driven pump. When activated by pushing the L (R) ENG
FIRE PUSH switch/light on the pilot’s or copilot’s glareshield, the SOV will close, stopping the
flow of fuel to the engine, and the BOTTLE ARMED PUSH TO DISCHARGE switch/lights will
illuminate. Successful closing of the engine fuel shutoff valve is indicated by a L (R) ENG SOV
CLOSED advisory EICAS message. If the valve fails to close, a L (R) ENG SOV caution EICAS
message is displayed.
The engine fuel shutoff valves are powered by the DC emergency bus. For additional
information, see Chapter 9, Fire Protection.
Fuel Filter
The engine-driven pumps are each equipped with a fuel filter. The filters are mounted adjacent
to the oil tank within the engine nacelle, and are monitored for contamination by an impending
bypass switch. An indication of impending bypass (filter clogged) is the L (R) FUEL FILTER
caution EICAS message.
Wash Filter
The wash filters are installed along the motive flow fuel feed lines, from the engine−driven pump
to the main and scavenge ejector pumps. The wash filter separates ice crystals, which may
have formed in the fuel, and channels them to the larger main ejector pump, thus protecting the
smaller scavenge ejector pump from possible clogging. There are no cockpit indications
associated with wash filter operation.
　
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