Piper COMANCHE PA-24-180 Service Manual page 491

PIPER COMANCHE SERVICE MANUAL
SECTION VIII
FUEL SYSTEM
8-1. Genenl.
8-2. Desripdon. The fuel cells on the Comanche consist of rayon-neoprene bladders which are contained
in cavities in the forward secaom of the wing. The main or inboard cells on all models hold a capaciry of 30
gallons each. Auxiliary cells on the PA-24-250 and PA-24-260 hold a capacity of 15 gallons each and on the
PA-24-400, 35 gallons each. There are no auxiliary fuel cells on the PA-24-180.
Fuel is taken from each cell through a screen located in the cell oudet and then onto the
shuroff-selector valve. From the selector the fuel is drawn through the sedimen bowl where it is filtered
and any waxer or sediment trapped.
The fuel pumps, both the engine driven and the elecmc auxiliary, deliver fuel direct to the carburetor
or injector. The fuel pumps on the carburetor induction system are connected parallel and the pumps on
the fuel injection system are connected in series. The fuel again is filtered before it enters the carburetor or
injector.
8-3. Fuel Cells.
8-4. Pre-Removal Intrucdons. When necessary, for any reason. to remove the fuel cell from the caviry or
to collapse it within the wing, it is suggested that the fuel cell be drained. then flushed. sprayed. or rubbed
with a light engine oil. Do nor remove the fuel cell until 24 hours have elapsed after the oil ha been
applied. This will keep the cell pliable until ready to reinstall.
8-5. Removal.
a. Drain the fuel cell. then turn the fuel selector valve to the off position.
b. Remove the flat-head screws from the oval cover place on top of the wing panel and remove place.
c. Disconnect the fuel sender unit wires from the unit.
d. Remove the unit mounting plate bolts and washers. both at the wing panel opening and at the cell.
Remove the sender unit plate and gasket, 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 :he filler
assembyv.
e. Remove the screws attaching the access plate or wing fainng to the fuel cell outlet molded nipple
fitting. Loosen the clamp so that the cell mav be drawn from the fuel line.
f. Place tape or other protective material around the cell access hole to prevent damage to the cell
when removing.
FUEL SYSTEM
ISSUED: 8/18/72
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