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SECTION 7
DESCR/OPERATION
7.17 FUEL SYSTEM (Continued)
Should the fuel boost pump in the fuel tank being used fail to produce
sufficient pressure, the BOOST PUMP light on the annunciator panel will
illuminate. In this event, confirm that the fuel selector is properly seated in the
detent for the selected tank. If the selector is properly seated, and the
annunciator remains lit, select the opposite tank. Since there may be difficulty
in obtaining the fuel from the tank with the malfunctioning boost pump, a
precautionary landing at the nearest suitable airport should be considered to
identify and correct the problem.
Should the engine driven fuel pump fail to produce sufficient pressure to
sustain engine performance, the FUEL PRESS light on the annunciator panel
will illuminate. Immediately select the emergency fuel pump ON. The FUEL
PRESS annunciator will extinguish when adequate fuel pressure is restored.
The emergency fuel pump should also be turned ON during takeoff and
landing.
Fuel leaving the left or right collector/sump tank flows to a selector valve
which is located on the right fuselage side behind the copilot's seat in a non-
pressurized compartment. All fuel lines passing through the pressurized cabin
are metal tubes surrounded by plastic cushion and encased by a second metal
tube. This second tube is sealed from the cabin environment to preclude fuel
from entering the cabin area or pressurized cabin air from entering fuel lines in
the event of a leak.
The selector valve is cable controlled by a thumbsized handle just below
the triple indicator for cabin pressurization. The detented selections are OFF,
LEFT, RIGHT. LEFT or RIGHT positions direct fuel flow to the engine from
the tank selected. To select OFF the fuel selector must be moved to the left tank
position, moved down against spring pressure, then moved to the far left, or
OFF position.
Fuel flows from the fuel selector forward to the fuel filter located below
the baggage floor on the right side. The filter drain is a nylon tube located on
the right side of the aircraft, forward of the wing. To drain fuel simply push in
the nylon tube. If contaminants clog the filter, an internal relief valve will allow
fuel to bypass the filter. This will allow unfiltered fuel to reach the engine and
could contaminate the fuel distribution system in the engine.
Regular servicing of the filter and examination
of fuel samples for contamination is required.
Fuel flows from the filter, forward through the emergency fuel pump
and firewall, into the engine compartment, to the engine-driven pump.
REPORT: VB-1710
7-34
NOTE
ISSUED: FEBRUARY 23, 1999
REVISED: SEPTEMBER 20, 1999
PA-46-350P, MALIBU
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