FUEL SYSTEM MALFUNCTIONS
Fuel Flow Interruption
Fuel ows by gravity from the wing tanks, through the fuel tank shutoff/
selector valves at the inboard portion of each wing tank, to the reservoir
located under the center cabin oorboard. Once the engine is started, the
main ejector pump (located inside the fuel reservoir) provides fuel ow to the
engine-driven fuel pump, at pressures ranging from approximately 4.5 PSI at
idle to 18 PSI at maximum power.
If the main ejector pump should fail, a pressure switch located near the
reservoir tank will cause the
FUEL PRESS LOW annunciation to display
on the PFD and will automatically turn on the auxiliary fuel pump (if the
switch is placed in the STBY position) anytime the fuel pressure falls below
approximately 4.5 PSI.
The red
RESERVOIR FUEL annunciation will illuminate anytime the fuel level
in the reservoir falls below approximately 1/2 full. If this should occur, the pilot
should immediately verify both fuel selectors are in the ON position and turn
both the ignition switch and auxiliary fuel pump ON.
If the fuel selector valves have been left in the OFF position, returning
them to the ON position will quickly ll the reservoir and thus extinguish the
RESERVOIR FUEL annunciation. Once the cause of the problem has been
corrected, the ignition switch may be turned OFF and auxiliary fuel pump
switch may be returned to its STBY position.
A “fuel selectors off” warning system is provided to warn the pilot if both fuel
selectors are placed in the OFF position. Included in the G1000 warning
system is a red annunciation labeled
FUEL OFF, and a warning chime. In
addition, a red LED warning light located near the pilot’s PFD will illuminate.
The LED warning light is labeled:
WARNING!
WHEN ILLUMINATED
BOTH FUEL SELECTOR VALVES ARE OFF
WARNING: Once the RESERVOIR FUEL annunciation illuminates, there
will only be about 3 minutes of fuel available in the reservoir, for engine
operation at maximum continuous power.
NOTE: Another possible cause of the RESERVOIR FUEL annunciation
being shown is an air bubble being trapped in the reservoir. To help clear
out fuel from the vent lines and eliminate the air bubble in the reservoir,
attempt a steady heading sideslip for 10 seconds in each direction.
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