PIPER
COMANCHE
SERVICE MANUAL
SECTION
VIII
FUEL
SYSTEM
8-1.
General_
8-Z_
o.criptioa_
The
fuel cells on the Comanche consiSt
of
rayon-neoprene bladden which
....
contained
in
avitin
in the forward sections
of
the
willi, The
maiD
or
inboard cells on all models hold a
apacity
of
30
pUons
each_
Auxiliary cells on the PA-Z4-Z50 and PA-Z4-Z60 hold a
,,"!,&City
of
IS p1lons each and
on
'he
PA-Z4-400,
35
pUons
each. Tb
........
no
&w<iliary
fuel cells on the PA-Z4-ISO.
Fuel
is
taken from each cell throuch a
s""",n
located in the cell
oud
..
and then onto
'he
shutoff
...
lector valve. From the selector the fuel
IS
drawn
throulh
the sediment bowl where it
is
filtered
and any water or sediment trapped.
The fuel pumps.
both
the engine driven and the electric auxiliary, deliver fuel direct
to
the carburetor
or
injector. The fuel pumps
on
the c:art>uretor induction system
....
connected parallel
a.ad
the pumps on
the fuel injection
synem
are connected in series.
The
fuel again
is
filtered beiore it
cnren
the carburetor or
injector.
8-3.
Fuel
Cells.
84.
Pre-Removal. InstrUctions. When necessary. for any reason. to remove the fuel cell from the
Clv1ry
or
to
collapse it within the wing. it
15
suggested that the fuel ceil
be
mined.
then flushed. sprayed. or rubbed
with a
light engine oil. Do no, remove the fuel cell until 24 hours have elapsed after
'he
oil
I,..
been
applied. This
will
keep the cell pliable until ready
'0
reinstall.
8-S. Removal.
L
Own
the fuel
ceU.
then
tum
the
fueJ
selector
ru\'c
to the off pOSItion.
b. Remove the flat·head screws from the oval cover plate on
tOP
of
the
Wing
panel and remove plate.
c.
Disconnect the fuel sender
unit
wires from the unl[.
d.
Remove the unit mounting plate bolts
utd
wuhen.
both
at
the wing panel opening and .u the cell.
Remove the
sender unit piate and gasket. being careful when sliding the plate
off
the drain and vent hose
not to damage the unit or bend the floa.t arm. On the outboard cell of the
PA·2~OO
remove
;:he
filler
assembly.
e.
Remove the screws attaching the access plate or wing fainng
to
the
fuel
cell outlet molded nipple
fiaing. Loosen the
damp
50
that the cell may
be
drawn from the fuel line.
f.
Place tape
or
other
protective material around
thl"
cell access
h.ole
to prevent
da.m~e'
to the cen
when removing.
FUEL
SYSTEM
ISSUED:
8/18172
2
113
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