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Section 7. Fuel
7.5.5 Electric Fuel Pumps
An electric fuel pump is located in each wing root. The electric pumps function in
parallel with the ejector boost pumps to pump fuel from the sump tanks to the
engines and are capable of supplying adequate fuel to both engines throughout the
flight envelope. The electric fuel pumps operate at a higher pressure and will
effectively override the ejector boost pumps. The electric fuel pumps are off during
most normal flight operations. The pumps start automatically in the following
situations:
1. Engine start
2. Automatic fuel balancing
3. Low fuel pressure/ Ejector boost pump failure
NOTE:
If low fuel pressure is detected (below 15 PSI), it is a likely indicator that an
ejector boost pump has failed. The corresponding electric fuel pump starts
and remains on for the duration of the flight.
4. Sump quantity 50 lbs or less
Manual control of the electric fuel pumps is available via two line selected keys on the
fuel synoptic. The electric fuel pump line select keys, labeled L PUMP and R PUMP,
are selectable between AUTO and ON. When an electric fuel pump is operating a
L(R) FUEL PUMP ON status message appears. The pump on status message will
not appear during automatic fuel balancing.
If low pressure is detected from an electric fuel pump, a L (R) FUEL PUMP FAIL
caution message appears and fuel crossfeed from the affected side is no longer
available.
7.5.6 Engine Fuel Pumps
Two engine-driven fuel pumps for each engine are located in the FMU (Fuel Metering
Unit). Fuel from the sump tank flows to the low pressure fuel pump and then through
the fuel/oil heat exchanger and fuel filter, located outside the FMU. Fuel flows from
the fuel filter to the high pressure fuel pump. This ensures that fuel is available to the
engine through all flight regimes. Excess fuel not needed by the engine is routed
under pressure to the sump tank as return fuel.
7.5.7 Fuel Filter
Before fuel flows to the high pressure fuel pump it passes through a fuel filter that
contains an impending bypass switch. This bypass switch allows fuel to bypass the
filter in the event of a restriction. Should this occur a L (R) FUEL FILTER advisory
message appears on the ground only, alerting the pilot of possible fuel contamination.
Should this bypass switch fail a L (R) FUEL BYPASS FAULT advisory appears on the
ground only. Flight with a failed bypass switch is prohibited.
Version 2.0 April 2007
Copyright © — Eclipse Aviation Corporation
Eclipse 5OO Systems Manual
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