Piper Lance II - Page 373

LANCE
II
SERVICE
MANUAL
SECTION IX
FUEL
SYSTEM
9-1.
DESCRIPTION.
The
fuel system
consists
of two
interconnected
aluminum
tanks
in
each
wing,
having
a combined
capacity
of 49
U.S.
gallons,
for
a total
capacity
of
98 U.S.
gallons.
These
tanks
form
a integral
part
of the
wing
surface
when
installed.
Fuel
flow
is
indicated
on
the
gauge
located
in
the instrument
panel.
A fuel
quantity
gauge
for each
wing
system
is
also
located
in
the instrument
panel,
and indicates
the
amount
of
fuel
remaining
as
transmitted
by
the
electric
fuel
quantity
sending
units
located
in
the wing
tanks.
An
exterior
sight
gauge
is installed
in the
inboard
tank
of each
wing
so
fuel quantities
can
be
checked
on
the
ground
during
the
preflight
of the
airplane.
Fuel
is drawn
through
a finger
screen
located
in
the
inboard
fuel
tank
and
routed
to
a
three
position
fuel selector
valve
and
filter
unit
which
is
located
aft
of
the main
spar.
The
valve
has
"OFF,"
"LEFT"
and
"RIGHT"
positions
which
are
remotely
selected
by
means
of
a torque
tube
operated
by
a
handle
located
in
the
pedestal.
The
handle
has
a spring
loaded
detent
to
prevent
accidental
selection
to the
"OFF"
position.
From
the
selector
valve
the
fuel
goes
to
the
electric
fuel
pump
which
is also
mounted
aft
of
the main
spar
and then
goes
forward
to the
engine
driven
fuel
pump
which
forces
the
fuel
through
the
injector
unit
into
the
engine.
Refer
to
Figure
9-1
or
9-2
for
layout
and
relationship
of the
fuel
system
and
components.
9-2.
TROUBLESHOOTING.
Troubles
peculiar
to the
instruments
and
related
areas
of
the
fuel
system
are
listed
in Section
X
along
with
their
probable
causes
and suggested
remedies.
Electrical
and
mechanical
troubles
of
the
system
are
found
in
Table
IX-II
at
the
back
of this
section.
When
troubleshooting,
check
from
the
power
supply
to
the
items
affected.
If no
trouble
is
found
by
this
method,
the
trouble
probably
exists
inside
individual
pieces
of
equipment;
they
may
then
be
removed
from
the
airplane
and
an identical
unit
or
units,
tested
and
known
to be
good,
installed
in their
place.
Issued: 1/3/78
FUEL SYSTEM
2D13