Fuel Cells Removal; Fuel System - Piper PA-24 Comanche Service Manual

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PIPER COMANCHE SERVICE MANUAL
SECTION VIII
FUEL SYSTEM
8-1. General.
8-Z.
DacriptiOD_
The fuel cells on the Comanche consist of ayon-neoprcne bladders which are contained
in cavities
in the forwud sections of the
wq.
The main or inboard cells on ill models hold a capacity of
30
gallons each. Auxiliary cells on the
PA·Z~Z50
and PA·Z4-Z60 hold a
~acity
of
15
pllon. ca.ch and on the
PA·24-400, 35 pllons each. There
art
no auxiliary fuel cells on the PA·24-180.
Fuel is taken from cuh cell UltoUJh a sC1'ftn located in the cell oudet and then onto the
shutoff-selector valve. From the Idector the
fuel
is drawn throulh the sediment bowl where it is filtered
and
any
water or sediment trapped.
The fuel pumps. both the CftJine driven and the electric auxiliary, deliver fuel direct to the carburetor
or injector. The fuel pumps on the carburetor induction systcrn
aM
connected
pan11e1
and the pumps on
the fuel injection system are connected in series. The fuel apin is filtered bdore it enters the carburetor or
injector.
8-3. Fuel
Ceo..
84. Pre-Rcmoval
Insuucaoftl.
When necessary, for any reason. to remove the fuel cell from the caviry or
to collapse it within the
wi",.
it is sugested that the fuel ceU be drained. then flushed. sprayed. or rubbed
with a light engine oil. Do not remove the
fuel
cell until 24
hours
have elapsed after the oil has been
applied. This will keep the cell pliable until ready to reinstall.
8·5. Ranov&!.
a. Drain the fuel cell, then tum the fuel seleeror VlL1ve 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 unit.
d. Remove the unit mounting plate bolts and washers. both at the wiDl panel opening and
at
the cell.
Remove the sender unit plate and
,askct,
being careful when sliding the plate off the drain and vent hose
not to damage the unit or bend the float
arm.
On the outboard cell of the PA·24-400 remove the filler
assembly.
e. Remove the screws attaching the "eess plate or wine f&iring to the fuel cell outlet molded nipple
fitting. Loosen the damp
50
that the cell may be: drawn from the fuel line.
£.
Place tape or other protective material around thr cell aceess hole to prevent
damag~
to the ceil
when removIng.
FUE
L.
SYSTEM
ISSUED: 8/18/72
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